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Hello.
I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all |
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Originally Posted By grizzlygunner999: Hello. I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all View Quote Don't know what gas port size they use. 1. Check alignment with FSB and port. 2. Check gas key on BCG 3. Check gas rings on bolt 4. Check gas tube for blockage and alignment with FSB/port. I've seen stuff drilled off so don't assume. 5. Verify gas port size, pain in ass but PS next time @Combat_Diver. Its anal, not me. CD |
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De Oppresso Liber
Iraq: 91,03,04,05,06,08,09,15,16,22’ Afghanistan: 09,10,11',14',17',18',19',20'&21' |
Originally Posted By grizzlygunner999: Hello. I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all View Quote View All Quotes View All Quotes Originally Posted By grizzlygunner999: Hello. I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all It looks like the DS Arms website states a gas port size of 0.072". https://www.dsarms.com/p-17126-ds-arms-ar15-mk18-103-556x45mm-service-series-upper-receiver-assembly.aspx DS Arms AR15 MK18 10.3" 5.56x45mm Service Series Upper Receiver Assembly Specifications: Forged 7075-T6 A3 M4 Upper Receiver Hardcoat Anodized per MIL-A-8625F, Type III, Class 2 Finish 1913 Mil-Spec Picatinny Top Rail M4 Feed Ramps on Upper Receiver Mil-Spec Port Door & Forward Assist Assembly Forged Front Sight Tower with Bayonet Lug - F Marked A2 Bird Cage Flash Hider 10.3" M4 Profile Barrel .750" Gas Block Diameter .072" Gas Port 4150 - 11595E Mil-Spec Barrel Steel Chrome Lined Chamber & Bore 5.56 NATO Chamber & Bore 1:7 Twist Rate M4 Feed Ramp Barrel Extension Barrel Features Mil-Spec Phosphate Finish Carbine Length Gas System Stainless Steel Gas Tube Barrel Threaded 1/2x28 Aluminum Delta Ring Knight's Armament Company M4 RAS Carbine Length Handguards - 1913 Spec. Picatinny Handguards. Ma-Tech Back Up Iron Sight With Ranging Upper half assembled as shown, no bolt, no carrier or charging handle included. All Parts U.S. Made and Assembled By DS Arms! Some of the extraction problems I've seen with non-military short barrels have been caused by the barrel chamber dimensions and / or, "roughness." My 10.3" Colt barrel has a larger gas port than my FN SOCOM 10.3" barrel and I think the FN is smaller than the Daniel Defense gas port too. How do the fired cases look? |
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Originally Posted By grizzlygunner999: Hello. I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all View Quote What ammo? That's the most important question here. I have that upper and it functions flawlessly with an H2 and sprinco blue. Suppressed and unsuppressed with nato pressure loads. |
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@Combat_Diver
Do you guys use Blue Loctite (242) on the front sight, rear sight, WMX200 screw and the 2 screws that hold the G33 magnifier to the EoTech FTS Mount? OR Do you just install them with no Loctite? Thanks |
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Originally Posted By FastCar: @Combat_Diver Do you guys use Blue Loctite (242) on the front sight, rear sight, WMX200 screw and the 2 screws that hold the G33 magnifier to the EoTech FTS Mount? OR Do you just install them with no Loctite? Thanks View Quote They are a removable item, so no loctite. CD |
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De Oppresso Liber
Iraq: 91,03,04,05,06,08,09,15,16,22’ Afghanistan: 09,10,11',14',17',18',19',20'&21' |
I miss the days of my youth where kids would play (as I did) with GI-Joe kits.
So I sort of complemented with them guns in my older years GI-Joe Kit 0023 by Solo__, on Flickr |
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Originally Posted By Solo_: I miss the days of my youth where kids would play (as I did) with GI-Joe kits. So I sort of complemented with them guns in my older years https://live.staticflickr.com/65535/52321999906_f17299b86f_h.jpgGI-Joe Kit 0023 by Solo__, on Flickr View Quote |
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God will not look you over for medals, diplomas, or degrees – but for scars
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For you guys with 10.3" Block II rifles, with the UID Labels from Carolina Laser Works.
For the Part number on the UID Label, do you guys put: MK18 MOD 1 OR Do you put 12972700 ? How do they show up in the wild, anybody has any pics of 10.3" rifles in the wild showing the UID Label? |
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Any leads on some in stock Colt Ambi Safeties?
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Originally Posted By Combat_Diver: MARSOC decided to stick with Knights. CD View Quote View All Quotes View All Quotes Originally Posted By Combat_Diver: Originally Posted By usmc_noma: Do any MARSOC components use the surefire cans or are the Marines strictly using the knights NT4? I've been scouring numerous photos, but a lot of what I'm finding is knights cans with the Marines. MARSOC decided to stick with Knights. CD @Combat_Diver 1) Is MARSOC the only group that uses the Taupe NT4 Suppressor, if not which other groups uses the NT4? 2) What shape UID Label does MARSOC use, do they use a Square, rectangle with round edges or rectangle with square edges. 3) For the Part number on the UID Label on MARSOC 10.3” rifles, what do you see the most of: MK18 MOD 1 OR 12972700 |
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Originally Posted By FastCar: @Combat_Diver 1) Is MARSOC the only group that uses the Taupe NT4 Suppressor, if not which other groups uses the NT4? 2) What shape UID Label does MARSOC use, do they use a Square, rectangle with round edges or rectangle with square edges. 3) For the Part number on the UID Label on MARSOC 10.3” rifles, what do you see the most of: MK18 MOD 1 OR 12972700 View Quote Haven't work with MARSOC guns since 16' in Iraq. Don't remember the UID if they even used them. Other SOF units used the NT4 up till the SF RC. Sorry, I can't answer your questions. Even on SF guns UIDs get worn off regularly. CD |
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De Oppresso Liber
Iraq: 91,03,04,05,06,08,09,15,16,22’ Afghanistan: 09,10,11',14',17',18',19',20'&21' |
Seeing some surplus black WMX 200’s on eBay etc. Any idea what these were used on?
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Is it correct to use a SP64046 barrel (gov't profile) in a Block II CQBR build? Or do I need a SOCOM profile?
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De Oppresso Liber
Iraq: 91,03,04,05,06,08,09,15,16,22’ Afghanistan: 09,10,11',14',17',18',19',20'&21' |
Originally Posted By DBrock07: Seeing some surplus black WMX 200’s on eBay etc. Any idea what these were used on? View Quote Was wondering the same thing and thought maybe the same units that had the black Elcan 269s had black wmx200's. Interested to know more as there are multiple available right now. |
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De Oppresso Liber
Iraq: 91,03,04,05,06,08,09,15,16,22’ Afghanistan: 09,10,11',14',17',18',19',20'&21' |
Originally Posted By Combat_Diver: Replaced Colt Govt profile with a FN SOCOM as only 10.3” on hand. https://www.ar15.com/media/mediaFiles/32677/E1537E3B-F50C-4279-A77F-AE5A38ED778C_jpe-2513831.JPG View Quote I wish another lot of those barrels would hit the market again. I missed out the first time. Pic thread: |
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Originally Posted By julyAZ: An A2 crane mod 0 lower. https://i.imgur.com/de58Dl9_d.webp?maxwidth=640&shape=thumb&fidelity=medium https://i.imgur.com/Orv6HB9_d.webp?maxwidth=640&shape=thumb&fidelity=medium View Quote For the love of everything holy please tell us someone did not engrave that on a transferable M16A2. |
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Not a Tennessee Squire
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Originally Posted By DBrock07: Seeing some surplus black WMX 200’s on eBay etc. Any idea what these were used on? View Quote View All Quotes View All Quotes Originally Posted By DBrock07: Seeing some surplus black WMX 200’s on eBay etc. Any idea what these were used on? Originally Posted By jake-cutter: Was wondering the same thing and thought maybe the same units that had the black Elcan 269s had black wmx200's. Interested to know more as there are multiple available right now. I doubt that it's a surplus light. When these were sold commercially you could buy black or the fde versions. They were approx. $350-400 after discount codes were applied from optics planet. |
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Old Delta 723's were commercial M16A2's with no property marks from what I recall.
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This was posted in the m4 block ii thread but here are some 4 prongs still in stock.
https://bevanballisticsolutions.com/product/surefire-socom-4-prong-flash-hider/ |
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Originally Posted By BlueDevilBrew: https://i.postimg.cc/k5Vpv7F5/IMG-5119.jpghttps://i.postimg.cc/x8VhdBm1/IMG-4872.jpg View Quote Drager LAR V |
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De Oppresso Liber
Iraq: 91,03,04,05,06,08,09,15,16,22’ Afghanistan: 09,10,11',14',17',18',19',20'&21' |
Originally Posted By AWZ1287: This was posted in the m4 block ii thread but here are some 4 prongs still in stock. https://bevanballisticsolutions.com/product/surefire-socom-4-prong-flash-hider/ View Quote ETA - as a note, I placed this order at 6AM and minutes later, order was shipped out with a tracking number. These guys are in Florida, too - way to go |
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Originally Posted By Solo_: Thanks for that, got my first ever 4 prongs at the lowest price I've ever seen ETA - as a note, I placed this order at 6AM and minutes later, order was shipped out with a tracking number. These guys are in Florida, too - way to go View Quote I got my shipping notice first thing this morning as well. I haven't ordered from them, but they are highly regarded on reddit. I'll have to keep them in mind when looking for other stuff. I was almost not going to bother checking the link in the other thread because it was hours late. Thinking it was for sure sold out. lol |
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Originally Posted By AWZ1287: I got my shipping notice first thing this morning as well. I haven't ordered from them, but they are highly regarded on reddit. I'll have to keep them in mind when looking for other stuff. I was almost not going to bother checking the link in the other thread because it was hours late. Thinking it was for sure sold out. lol View Quote |
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Originally Posted By DBrock07: Some of them are coming with discharge paperwork making me think they were issued somewhere. https://i.imgur.com/ZN501pw.jpg https://i.imgur.com/7I8iND3.jpg View Quote These were auctioned on Gov Planet earlier this year. Lot of 34 out of Hawaii. |
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Originally Posted By AWZ1287: https://www.ar15.com/media/mediaFiles/469589/20220912_112439_jpg-2523459.JPG View Quote |
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God will not look you over for medals, diplomas, or degrees – but for scars
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Originally Posted By AWZ1287: https://www.ar15.com/media/mediaFiles/469589/20220912_112439_jpg-2523459.JPG View Quote |
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Originally Posted By grizzlygunner999: Hello. I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all View Quote Bolt failing to lock back makes me think overgassed, that the carrier is outrunning the magazine follower. Go back to the H2 and even try an H3 to see if it locks back when limp wristing it. Also find a colt buffer spring if you can. |
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Originally Posted By grizzlygunner999: Hello. I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all View Quote @mbf11 Mike, Are the GP diameters on these 0.070" |
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Originally Posted By AWZ1287: https://www.ar15.com/media/mediaFiles/469589/20220912_112439_jpg-2523459.JPG View Quote What am I missing? |
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Originally Posted By TGWLDR: @mbf11 Mike, Are the GP diameters on these 0.070" View Quote View All Quotes View All Quotes Originally Posted By TGWLDR: Originally Posted By grizzlygunner999: Hello. I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all @mbf11 Mike, Are the GP diameters on these 0.070" DS Arms says the gas port is 0.072". It could be ammo related, but often it's the barrel chamber dimensions, finish and chrome lining that can make extraction more difficult than usual. They may have gone to a smaller gas port, but if they say 0.072", it likely is. The gas ports in my 10.3' Colt barrels are slightly larger than the gas port in my FN 10.3" SOCOM barrel. https://www.dsarms.com/p-17126-ds-arms-ar15-mk18-103-556x45mm-service-series-upper-receiver-assembly.aspx https://www.dsarms.com/p-17272-ds-arms-ar15-mk18-mod-1-103-556x45mm-service-series-upper-receiver-assembly-fde-handguard.aspx |
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Originally Posted By Air_Soft_Contractor: It looks like the DS Arms website states a gas port size of 0.072". https://www.dsarms.com/p-17126-ds-arms-ar15-mk18-103-556x45mm-service-series-upper-receiver-assembly.aspx Some of the extraction problems I've seen with non-military short barrels have been caused by the barrel chamber dimensions and / or, "roughness." My 10.3" Colt barrel has a larger gas port than my FN SOCOM 10.3" barrel and I think the FN is smaller than the Daniel Defense gas port too. How do the fired cases look? View Quote At 0.072", it's not under gassed. And agreed regarding chamber dimensions/surface finish. |
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Originally Posted By Solo_: ... a few of us bought from this place - at reasonable price - the SF 4 prongs and it came with those stickers... pretty rad. Between the fair price and the stickers, I'd do it again Mine https://live.staticflickr.com/65535/52354140179_339d420efd_h.jpgEat it by Solo__, on Flickr View Quote Ok. I figured maybe there was something special about the SF4P in the photo. Thankfully these are now standard SF products so everyone can quit hyping them up. |
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Originally Posted By Solo_: ... a few of us bought from this place - at reasonable price - the SF 4 prongs and it came with those stickers... pretty rad. Between the fair price and the stickers, I'd do it again Mine https://live.staticflickr.com/65535/52354140179_339d420efd_h.jpgEat it by Solo__, on Flickr View Quote They make black UHPs? |
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Originally Posted By TGWLDR: @mbf11 Mike, Are the GP diameters on these 0.070" View Quote View All Quotes View All Quotes Originally Posted By TGWLDR: Originally Posted By grizzlygunner999: Hello. I recently built a 10.3 with DSA arms FSB barrel. I test fired today and could get it to cycle. I was getting double feeds and failure to lock the bolt back. I tried running a h2 buffer to begin with and was ejecting at 3 o clock pretty softly and only single shot. I tried a standard carbine buffer and spring. It cycles better and ejects at 4 o clock but the bolt doesn't lock back on the last round. Any ideas. I also checked the gas tube alignment with the bolt out of the carrue and no drag and is centered perfectly. I have built several m4s with FSBs. I think it needs more gas and I'm not sure what dsa gas port spec is on these Any help is appreciated Maybe @combatdiver can advise Thanks all @mbf11 Mike, Are the GP diameters on these 0.070" I have seen a couple of times where some short barrels accidentally get 14.5" or 16" barrel size gas ports and act the same way. |
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