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Posted: 5/22/2011 4:31:08 PM EDT
| Any leads on a 10.5"-11.5" 45 ACP upper? |
Just built this one for a friend on his stripped AR45 lower......so the handguard is his idea, I just made it....and It still has to be annodized  ....but it runs great.......only have a box through it now....but plan to run another 100 rounds through it before I hand it over....it is a gas operated 7.5 barrel.......but I started with a 20 inch blank....so length wasn't an issue
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thats some sweet work there on that forearm
but don't you think it needs a line of air holes/vents along the top to hold down the mirage ?? I would tend to think that with the only escape route for the barrel heat right at the muzzle it would create a rather large area of mirage, I know the smooth round forearms tend to be used for target rifles, but they would not be sending as many rounds downrange as fast as you would with that AR45 w/ a full grease gun mag |
so you have to deal with "this is what I want, and I don't want any input from you" ..... 
custom work is always interesting and informative, especially when done right I wish that I had access to a CNC lathe & 4-axis horizontal mill that accept standard G & M code Oh, the toys that I could knock right outta-the-ballpark !!
I used to make the programmer give me "the look" over the top of his glasses when I would walk into his office with a new sub-routine program for the big 800mm pallet 4-axis horizontal mill all written out with speeds & feeds & tell him that I already "proofed" it 
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yeah, there were plenty of "button pushers" I worked with that didn't have a clue
I tried to tell them, "the program printed on that paper (hardcopy) is just a road map, showing you what tools are driving where". the beauty of CNC is being able to keep "cloning" parts, one after another, every one the same (as long as you do your part) |
Just thought I throw up a couple more pics of the finished product.....had problems with the annodizer I was gonna use,and I REALLY like the result....my powder coat guy had some cerokote and suggested trying it....very difficult to tell the difference in it and annodizing.
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that looks very good !
I just received my upper from UPS yesterday, had a bit of a problem fitting it to Justins CNC Guns lower (talk about a tight fit) cleaned everything & lubed'er up and took it out for a test run, put 4 mags thru her, that took some time to do ....... nothing that I really did not expect .......... there were stovepipes, FTF/FTE (both at the same time too) mags dropping out (will dimple the metal where the catch fits in so the catch will drop in farther than it now does) I have to open the ejection port for more reliable ejection & to prevent stovepiping the first run was basically to "wring it out", find the bugs, and get some wear marks on parts to figure things out I'll see how things go after the "scheduled work" & a thorough cleaning, I should have better results, I hope ..... |
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As far as the mag dropping.....look at the mag itself.....the recess for the mag catch on some mags is "D" shaped....some it is square.....the square feel and sound like they latch...but drop when you shoot...they can be modified with a 3/8 endmill and will work perfectly.
Fit wise I buy uppers from LAR to build on and thet mate up perfect with Justins lowers.... If the upper is an Olympic arms.....the issues with feed could be due to the new style feed ramp.......they modified it from the one the AR45 lower was designed to run with in order to accomodate those billious plastic magazines/bilboards they came out with.... Only malfunction I have had with the gas pistol above is if you limp wrist it....it'll short stroke and not feed correctly....but with a firm grip I ran two mags of 25 rounds each through it flawlessly this afternoon. Let me know if I can help ya with it....I've built a few dozen AR45's
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@Mad-Machinist.
Ok where did you gey your Buffertube assembly? Is that your work or a retail part? I looked all over for that size. I ended up using a Spikes Pistol Buffer Assembly. Will that length tube only work with a gas system or could it be put on a 9mm blowback style AR pistol. I really want that length but for some reason I have a feeling I cant use it w/my 9mm. Please any info! BC |
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@Mad-Machinist. Ok where did you gey your Buffertube assembly? Is that your work or a retail part? I looked all over for that size. I ended up using a Spikes Pistol Buffer Assembly. Will that length tube only work with a gas system or could it be put on a 9mm blowback style AR pistol. I really want that length but for some reason I have a feeling I cant use it w/my 9mm. Please any info! BC It is a Gunsmoke Enterprises buffer.......and you are correct....won't work with a blowback action.....the guide rod and recoil spring on it actually nest up inside the bolt carrier..... |
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As far as the mag dropping.....look at the mag itself.....the recess for the mag catch on some mags is "D" shaped....some it is square.....the square feel and sound like they latch...but drop when you shoot...they can be modified with a 3/8 endmill and will work perfectly. Fit wise I buy uppers from LAR to build on and thet mate up perfect with Justins lowers.... If the upper is an Olympic arms.....the issues with feed could be due to the new style feed ramp.......they modified it from the one the AR45 lower was designed to run with in order to accomodate those billious plastic magazines/bilboards they came out with.... Only malfunction I have had with the gas pistol above is if you limp wrist it....it'll short stroke and not feed correctly....but with a firm grip I ran two mags of 25 rounds each through it flawlessly this afternoon. Let me know if I can help ya with it....I've built a few dozen AR45's I dimpled the recess for the mag catch, and that let the catch bottom out but the mags still could be worked out without pushing the mag release so I made a small chisel from a old power hack saw blade, turned the mag upside down, set the lips on a piece of rubber sheeting and drove the small chisel under the cut for the mag catch, raising the edge about 0.075" or more along the straight part of the cutout, now you can not force a mag out of the magwell I also had some stove-piping/failure to eject issues so I opened the ejection port, that should solve that problem |
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All of the .45 ACP uppers I have seen have been blowback operated. How did you adapt it to gas? There are a couple people who are making them, but RonalMWilliams was the first to get one to run a few years back. Yep. Once I pulled this off seems there were a couple to follow in my foot steps 
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All of the .45 ACP uppers I have seen have been blowback operated. How did you adapt it to gas? The gas operated upper is actually pretty simple.....450 Bushmaster bolt, standard bolt carrier, custom gas block and tube, lightened recoil spring and buffer, and a custom barrel made up using a regular AR barrel extension. A few tweaks here and there and Viola.....gas op upper.....
The worst part about a .45 is feeding it....finding a suitable magazine/lower combination that will deliver the rounds reliably. Two schools of thought oin cutting the feed ramp in the barrel extension and my method invloves leaving all the locking lugs intact but it makes the gun much more dependent on tuning to make it run reliably. My personal AR45 carbine is my truck gun and has well over 10K of GI ball through it....and I don't remember the last time I had a malfunction My personal is an 11 inch barrel with a flash supressor, and a CNCguns AR45 lower reciever. I have built on a Cav arms lower and it ran GREAT but I currenlt have another cav arms lower that seperated inforn t of the magwell between the ears for the front takedown pin. If you want to build your own...I am working on my own design short buffer and a few other cool ideas I hope to show off in the near future. If you want to build youe own ....I'll be happy to answer any questions I can to help you in your build....
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I own both the Oly and RW upper. The Oly is heavy, so a pistol version pistol would be a bit much. The Oly carrier has a tungsten insert at the rear, where the GSE insert would nestle.
DI is the only way to go in 45acp. If only someone would perfect it in 9mm (hint, hint). Like MM, my favorite is the DI with an 11 inch barrel and blind pinned 5.5 inch FH. I use a standard spring and a no weight buffer. I haven't tried a reduced weight spring... hmmm. The pistola makes me want... darn you MM. How about a barrel/buffer combo that would be 26.5 inches long with a VFG? Not NFA, but darn close to a Thompson twin. buckmeister |
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All of the .45 ACP uppers I have seen have been blowback operated. How did you adapt it to gas? The gas operated upper is actually pretty simple.....450 Bushmaster bolt, standard bolt carrier, custom gas block and tube, lightened recoil spring and buffer, and a custom barrel made up using a regular AR barrel extension. A few tweaks here and there and Viola.....gas op upper.....
The worst part about a .45 is feeding it....finding a suitable magazine/lower combination that will deliver the rounds reliably. Two schools of thought oin cutting the feed ramp in the barrel extension and my method invloves leaving all the locking lugs intact but it makes the gun much more dependent on tuning to make it run reliably. My personal AR45 carbine is my truck gun and has well over 10K of GI ball through it....and I don't remember the last time I had a malfunction My personal is an 11 inch barrel with a flash supressor, and a CNCguns AR45 lower reciever. I have built on a Cav arms lower and it ran GREAT but I currenlt have another cav arms lower that seperated inforn t of the magwell between the ears for the front takedown pin. If you want to build your own...I am working on my own design short buffer and a few other cool ideas I hope to show off in the near future. If you want to build youe own ....I'll be happy to answer any questions I can to help you in your build....
Yes the DI45 is pretty basic. Funny that no one was offering them until I built one 
No, I do not remove any lugs compleatly. I do ramp some but no compromise to the system. Feeding is pretty strait forward. I have modified GG mags to work in std lowers. no need for a specialty lower if you dont want to buy one. |
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I commisioned Marty at Teppo Jutsu to design a DI setup before I even knew Ron was working on his design. I gave Marty too many restrictions to work within and while the prototype worked for .45 Super, it wouldn't run with .45 ACP. Ron did get his out there first but I wager a few of us were all working toward the same goal at or about the same time. I can say, I did not get the idea from Ron. I was working my my idea independant of anyone else. Others beat me to the punch and I took overseas employment so I moved onto other projects.
I long thought there was a market for .45 ACP AR stuff. The DI setups killed the monopoly Oly had on the market and helped to expand the market even furthur. |
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Just thought I throw up a couple more pics of the finished product.....had problems with the annodizer I was gonna use,and I REALLY like the result....my powder coat guy had some cerokote and suggested trying it....very difficult to tell the difference in it and annodizing. http://i368.photobucket.com/albums/oo121/MadMachinist/P1010007.jpg Beautiful work there Mad-Machinist. Hope one day I'm own something similar
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Thanks for the kind words............and you might be surprised sooner than you think....here is a little something I've been playing with.....stock lower, new .45 Uzi mag from promag and a little magwell adaptor I whipped up..... runs great with the upper off my CNC Guns AR45........I still prefer it as the prmary platform.......in fact it is pretty much my truck gun but this is an entry level alternative
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