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Posted: 2/5/2022 1:16:56 PM EST
Anyone print this yet? It's going on my printer right now...
Might have to mod it for a standard lower... or just print a Hoffman! hoffmantactical.org This "Forced Reset" style trigger modification is designed to function with a standard "mil-spec" semi-auto trigger and hammer. Other triggers and hammers may not function properly, or at all. The Block is designed to mount in the Hoffman Tactical V2.8 and V3.0 AR-15 Lowers. It will also mount in the V1.0 AR-9 lower. With a little more work, I think this block can be made to fit in any AR-15. 
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Posted: 2/5/2022 1:37:33 PM EST
[#1]
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Posted: 2/5/2022 3:29:14 PM EST
[#2]
I love everyone thumbing their nose up at the ATF.
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Posted: 2/5/2022 4:38:38 PM EST
[#3]
I think I see how the reset works, but I dont see what handles the disconnect function?
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Posted: 2/5/2022 5:00:12 PM EST
[#4]
Quote HistoryQuoted: I think I see how the reset works, but I dont see what handles the disconnect function? The sear on the trigger, and the 'safety' is what holds the trigger until the bolt is locked and you pull the trigger again. |
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Posted: 2/5/2022 5:28:56 PM EST
[#5]
Awesome! I’ve printed Hoffman’s v3 lower. Exchagef some emails with him as well. Super nice guy. Even gave me the STEP file so I could add my own roll mark and make other little tweaks.
Lower turned out perfect. Printed on an Anycubic Vyper with 3D Fuel Pro PLA. Sliced in PrusaSlicer. Haven’t built it out completely yet. But have test fit pretty much everything. Mag is snug but drops free. Receiver extension threads in with ease.  Attached FileThis FRT add-on has my interest. Would make the trigger more enticing. Wonder if he’ll do them for the WOT as well. |
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Posted: 2/5/2022 5:35:21 PM EST
[#6]
Quote HistoryQuoted: Awesome! I’ve printed Hoffman’s v3 lower. Exchagef some emails with him as well. Super nice guy. Even gave me the STEP file so I could add my own roll mark and make other little tweaks. Lower turned out perfect. Printed on an Anycubic Vyper with 3D Fuel Pro PLA. Sliced in PrusaSlicer. Haven’t built it out completely yet. But have test fit pretty much everything. Mag is snug but drops free. Receiver extension threads in with ease. https://www.ar15.com/media/mediaFiles/460645/EE5CB917-2187-42C1-B3AB-31256FF84CBC_jpe-2268169.JPG This FRT add-on has my interest. Would make the trigger more enticing. Wonder if he’ll do them for the WOT as well. My updates to make this compatible with the MilSpec lower are coming along well so far, and think I'm on my final iteration. Regarding your last point, this does NOT modify Rare Breed's FRT. This adds parts and replaces a part to a milspec FCG, to emulate Rare Breed's FRT. You do not have to own Rare Breed's to make this work! |
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Posted: 2/5/2022 5:40:26 PM EST
[#7]
Quote HistoryQuoted: My updates to make this compatible with the MilSpec lower are coming along well so far, and think I'm on my final iteration. Regarding your last point, this does NOT modify Rare Breed's FRT. This adds parts and replaces a part to a milspec FCG, to emulate Rare Breed's FRT. You do not have to own Rare Breed's to make this work! Well shit. Even better.  I don’t have Instagram. Checked his YT channel and didn’t see anything yet. So was just assuming. Is it a 3 position? Safe-Regular-Forced (or vice versa). |
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Posted: 2/5/2022 5:49:57 PM EST
[#8]
Quote HistoryQuoted: Well shit. Even better. I don’t have Instagram. Checked his YT channel and didn’t see anything yet. So was just assuming. Is it a 3 position? Safe-Regular-Forced (or vice versa). No, this is just Safe-Forced. However, there is another designer working on a Safe-Semi-Forced FRT called the 'Invisiboogle-CBT'. It's currently in beta, though. I have printed it, but haven't installed it yet. |
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Posted: 2/5/2022 6:04:01 PM EST
[#9]
Quote HistoryQuoted: No, this is just Safe-Forced. However, there is another designer working on a Safe-Semi-Forced FRT called the 'Invisiboogle-CBT'. It's currently in beta, though. I have printed it, but haven't installed it yet. Nice! Will have to go snag the files and print one as well. That name too 
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Posted: 2/5/2022 6:41:54 PM EST
[#10]
Quote HistoryQuoted: The sear on the trigger, and the 'safety' is what holds the trigger until the bolt is locked and you pull the trigger again. Ahh, I think I see now. Tail on the hammer hits the thing that takes the place of the disconnector, resetting trigger to where it catches the hammer, the "safety" locks it into this position. Closing bolt hits the safety, allowing trigger to be pulled for the next shot. Can we call it a Fully Semi Automatic Safety?
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Posted: 2/5/2022 6:44:35 PM EST
[#11]
Welp, got it working (dry fire) on a milspec lower!
ended up tweaking all the parts. still tweaking the safety for a bit more engagement on the BCG. I'll post the files on odysee once things are tweaked to my satisfaction. |
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Posted: 2/5/2022 6:45:05 PM EST
[#12]
Quote HistoryQuoted: Ahh, I think I see now. Tail on the hammer hits the thing that takes the place of the disconnector, resetting trigger to where it catches the hammer, the "safety" locks it into this position. Closing bolt hits the safety, allowing trigger to be pulled for the next shot. Can we call it a Fully Semi Automatic Safety? Yup, you got it. |
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Posted: 2/5/2022 6:47:27 PM EST
[#13]
I have a couple of Hoffman lowers, this might be good to try out a forced reset trigger. Except I went to the hoffmantactical website and it appears he has exceeded his bandwidth. It must be very popular.
I'll have to look around to see if I can find it somewhere else. |
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Posted: 2/5/2022 6:52:14 PM EST
[#14]
Quote HistoryQuoted: I have a couple of Hoffman lowers, this might be good to try out a forced reset trigger. Except I went to the hoffmantactical website and it appears he has exceeded his bandwidth. It must be very popular. I'll have to look around to see if I can find it somewhere else. he has a .org backup 
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Posted: 2/5/2022 10:07:15 PM EST
[#15]
Quote HistoryQuoted: No, this is just Safe-Forced. However, there is another designer working on a Safe-Semi-Forced FRT called the 'Invisiboogle-CBT'. It's currently in beta, though. I have printed it, but haven't installed it yet. Mine binds in boogle mode. Bolt doesn't move full stroke. I think the metal insert is not thin enough to move past the disconnector but I have other projects at the moment. |
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Posted: 2/5/2022 10:23:19 PM EST
[#16]
Quote HistoryQuoted: Mine binds in boogle mode. Bolt doesn't move full stroke. I think the metal insert is not thin enough to move past the disconnector but I have other projects at the moment. That metal plate is probably too tall... file a little bit off the top, test, then repeat until the bolt doesn't drag. I had the same issue with this until I lowered the hammer/plate interface. |
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Posted: 2/5/2022 10:42:14 PM EST
[#17]
Finally happy with the mods... Had to tweak every part. A few options on the block and safety are included. Have not livefire tested, yet.
https://thangs.com/scul/HT-FRT%20milspec%20remix-48971?manualModelView=true 
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Posted: 2/5/2022 11:46:33 PM EST
[#18]
This community is awesome
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Posted: 2/5/2022 11:58:45 PM EST
[#19]
Quote HistoryQuoted: This community is awesome Agreed. The signal is alive and well. |
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Posted: 2/6/2022 12:08:27 AM EST
[#20]
I can't wait to get home. Really need to get my ender3 set up and printing. Might be a few months, but I would love to do a side by side with my frt.
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Posted: 2/6/2022 10:24:04 AM EST
[#21]
Quote HistoryQuoted: That metal plate is probably too tall... file a little bit off the top, test, then repeat until the bolt doesn't drag. I had the same issue with this until I lowered the hammer/plate interface. Tall, probably not. Wide, yes. I had to take down the width before install as it wouldn't slide past the disconnector. Probably need more. I have 2.5 builds in progress right now so that is the least of my worries. When my reweld builds are done I'll look I to it again. |
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Posted: 2/6/2022 10:47:56 AM EST
[#22]
I assume that's a wear part, right? Having the metal BCG hitting it repeatedly has got to cause failure at some point, no?
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Posted: 2/6/2022 12:00:24 PM EST
[#23]
Quote HistoryQuoted: I assume that's a wear part, right? Having the metal BCG hitting it repeatedly has got to cause failure at some point, no? Yes. I did try to maximize the BCG engagement surface. Print a few extra for when they wear out! Base is on the right, my 2x wide on the left. 
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Posted: 2/6/2022 12:14:39 PM EST
[#24]
Have you tested the results of the outcome if this part breaks while being used?
ie, What's the mean time to failure for it? Does part of the plastic fall into the mechanism resulting in the entire gun stopping until it's fixed? Does it cause some other sort of unintended consequence? |
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Posted: 2/6/2022 12:58:29 PM EST
[#25]
Quote HistoryQuoted: Have you tested the results of the outcome if this part breaks while being used? ie, What's the mean time to failure for it? Does part of the plastic fall into the mechanism resulting in the entire gun stopping until it's fixed? Does it cause some other sort of unintended consequence? No idea. I saw the Hoffman Files yesterday just before I posted OP, and did all the design testing yesterday afternoon. I'd suspect the safety just deforms to where the BCG doesn't engage properly. No idea if something will break off and jam up the rifle. However, as this is a SAFE / FRT model, if the safety doesn't release, the hammer shouldn't fall. |
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Posted: 2/6/2022 5:34:40 PM EST
[#26]
the Invisiboogle-CBT looks interesting..
Grabbed your files and going to take a look at it. I have a CNC engraver that can do light mill work. Might try to carve out the highwear parts out of 4140. |
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Posted: 2/6/2022 5:40:31 PM EST
[#27]
Do you think the length of the sear hump changes much?
Noticed on my Noreern lowers it seems shorter. *edit seems that is not an issue.   |
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Posted: 2/6/2022 7:09:35 PM EST
[#28]
Quote HistoryQuoted: Do you think the length of the sear hump changes much? Noticed on my Noreern lowers it seems shorter. *edit seems that is not an issue. https://i.imgur.com/KQMWKQZ.jpg Yup, not an issue... main index is off the oval cutout in the upper  That said, yes, your sear hump is shorter than mine... |
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Posted: 2/6/2022 7:10:34 PM EST
[#29]
Quote HistoryQuoted: the Invisiboogle-CBT looks interesting.. Grabbed your files and going to take a look at it. I have a CNC engraver that can do light mill work. Might try to carve out the highwear parts out of 4140. I expect the safety to be highest, followed by the plate. I've not done much testing to back that up, though. |
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Posted: 2/6/2022 9:14:44 PM EST
[#30]
Quote HistoryQuoted: I expect the safety to be highest, followed by the plate. I've not done much testing to back that up, though. I know a guy that got a laser cutter, and hes rough cut some obscure repair parts for me ( pistol hands, on a couple of very old Japaneses revolvers. got to love customers.). Might run the the flat pieces over and see what it would cost to get a set zapped out. |
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Posted: 2/7/2022 12:29:07 AM EST
[#31]
Quote HistoryQuoted: Finally happy with the mods... Had to tweak every part. A few options on the block and safety are included. Have not livefire tested, yet. https://thangs.com/scul/HT-FRT%20milspec%20remix-48971?manualModelView=true https://i.imgur.com/pce5SJo.jpg omg duh.. just noticed the OP name matches.. so.. yeah.. its 12:31 and my brain is pudding. well then cheers, as I just pulled the odysee version off the printer. |
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Posted: 2/7/2022 10:00:00 AM EST
[#32]
Quote HistoryQuoted: omg duh.. just noticed the OP name matches.. so.. yeah.. its 12:31 and my brain is pudding. well then cheers, as I just pulled the odysee version off the printer. Yes, that's the same. Also, this should work with either low shelf or high (with my single high shelf lower) |
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Posted: 2/7/2022 10:18:11 AM EST
[#33]
I need to get a 3d printer.
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Posted: 2/7/2022 10:49:52 AM EST
[#34]
Quote HistoryQuoted: Yes, that's the same. Also, this should work with either low shelf or high (with my single high shelf lower) so how much motion is expected in the safety? it doesnt seem to be able to move far before getting stopped.. maybe 3mm? also maybe dumb but the disconnector spring is very similar to the AR-15 bolt hold open spring - havent tried it yet, but any reason not to use that - esp since it is going to be disused. |
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Posted: 2/7/2022 11:18:22 AM EST
[#35]
Quote HistoryQuoted: so how much motion is expected in the safety? it doesnt seem to be able to move far before getting stopped.. maybe 3mm? also maybe dumb but the disconnector spring is very similar to the AR-15 bolt hold open spring - havent tried it yet, but any reason not to use that - esp since it is going to be disused. It's about 25* of rotation. I don't think the disconnector spring will be long enough. The spring path is just over 9mm at full travel. 
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Posted: 2/7/2022 11:20:12 AM EST
[#36]
Quote HistoryQuoted: I need to get a 3d printer. Yes you do! There is a 3 position in beta dev (by someone else) that would be perfect to bring your bumpsaw back to life! |
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Posted: 2/7/2022 12:15:10 PM EST
[#37]
Quote HistoryQuoted: Do you think the length of the sear hump changes much? Noticed on my Noreern lowers it seems shorter. *edit seems that is not an issue. https://i.imgur.com/KQMWKQZ.jpg Can 100% confirm, it was not an issue.  |
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Posted: 2/7/2022 12:21:48 PM EST
[#38]
Am I going to have to buy a 3D printer now?
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Posted: 2/7/2022 12:52:06 PM EST
[#39]
Quote HistoryQuoted: Am I going to have to buy a 3D printer now? 
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Posted: 2/7/2022 7:29:09 PM EST
[#40]
any thoughts on materials? it seems like your finger vs the bolt carrier thus some forces involved. what do you guys think?
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Posted: 2/7/2022 7:40:33 PM EST
[#41]
Quote HistoryQuoted: any thoughts on materials? it seems like your finger vs the bolt carrier thus some forces involved. what do you guys think? Carbon fiber nylon, naturally 
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Posted: 2/7/2022 7:40:41 PM EST
[#42]
Quote HistoryQuoted: any thoughts on materials? it seems like your finger vs the bolt carrier thus some forces involved. what do you guys think? |
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Posted: 2/7/2022 7:59:38 PM EST
[#43]
Quote HistoryQuoted: any thoughts on materials? it seems like your finger vs the bolt carrier thus some forces involved. what do you guys think? I've had decent luck with eSun PLA Pro. BCG eats up the safety, though. Print a few extras for the range! Straight PETG just shatters... this was after 4-5 dry cycles, and is shattered across the layers!  printed as it lays 
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Posted: 2/7/2022 8:00:44 PM EST
[#44]
Quote HistoryQuoted: I don't expect these parts to last long. I think the hammer will dig a hole in the disconnector replacement. safety seems to take the most abuse.
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Posted: 2/7/2022 8:40:18 PM EST
[#45]
Quote HistoryHave you live fired it?
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Posted: 2/7/2022 8:50:53 PM EST
[#46]
Quote HistoryQuoted: Have you live fired it? not yet. and that probably will change things with the BCG speed. with just racking the charging handle as fast as I can, I've seen very minimal marking on the plate. Others have live fired this, though. |
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Posted: 2/7/2022 9:23:17 PM EST
[#47]
Got it working for dry fire. Ready to test it live
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Posted: 2/7/2022 10:03:18 PM EST
[#48]
Here's a pic of someone else's live fire test. 2 mags, and had trouble with M855. M193 worked better.
Lots of plastic shavings in the FCG pocket. 
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Posted: 2/7/2022 10:32:15 PM EST
[#49]
Quote HistoryQuoted: Carbon fiber nylon, naturally yeah, not ever a bad choice.. i dont have any tho.. i do have some polymax pc.. my test prints are in ABS, but I dont think that will hold up long. if this cant handle 500 rounds without breaking then next up might be make the part with a dremel and some 1/16 sheets by making a jig. |
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Posted: 2/7/2022 10:46:24 PM EST
[#50]
PLA+ can give you a good proof of concept.
Hypothetically one could run 40-50 rounds through a 10.5" with a can and not see much wear at all I would think? |
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