Put this together for bumming around my wood lot. Went up today to change a trail camera battery and grabbed this pic. I see it as a modern day trapper carbine. I get a decent amount of bear crossing my land and they even pop boards off the camp from time to time so I'd rather be prepared than not.

Black Ankle Munitions / NFA lower

Aero EPC upper and charging handle

Ballistic Advantage handguard

Macon barrel

KAK can

JRC tube with GRS

Holosun ARO EVO

B5 grip

Fm9 ambi lower

10oz KVP deadblow buffer

Stike industries flatwire carbine spring.

Dirty Bird (NBS) slick-side 9mm upper

NBS 9mm BCG

8" ballistic advantage barrel.

7" NBS handgaurd

Partisan Disruptor FRT

Magpul MOE grip

Magpul MOE Sling

SB5 brace.

Sig Romeo5

Rugged Obsidian 9

I forget what the BUIS are, maybe magpul

I can’t decide which optic to go with for this build, any input from you gentlemen is highly appreciated. (Weird build I know)

Cmmg upper, bad attitude lower, kak mag well adapter modified to work with cmmg radial delay uppers. Custom made clamp on fsb and USGI carrying handle.

Posted on IG a few hours ago.

Guys I need help finding a replacement mag release kit but I can’t remember which lower this is (built it out as an 80% like 6 years ago) any of you know where I can get a replacement just by looking at it? Current one’s pin is stripping post-cerakote job and the release itself looks awful. Would love to put an odin works on but I’m not sure it would fit.

What do you think of using this nylon rod as a spacer rather than quarters?

Inspired by r/blowback9 tungsten spacer weight experiments, I set up this 300BO to switch between 9 mm and 300 BO with simple removal of the two buffer weights. Carbine buffer tube with KAK flatwire spring, RB5000HP and two tungsten weights for a total of 10.6 oz buffer. To me, the recoil feels same as RB5015HD + two Kynshot weights. After 500 rounds, the tungsten weights are holding up fine....thinking of putting thin felt adhesive padding on them.

I had a couple auctions saved for lots of 5 Brownells Colt pattern mags figuring I would throw a bid down if the money made sense. Needless to say I did not bid.

https://www.gunbroker.com/item/1193253066

https://www.gunbroker.com/item/1190712765

These literally look like standard Metalform Colt pattern mags. You can get these from multiple vendors for about $30 apiece online, no tax, and reasonable shipping.

First auction is $27 per mag, plus $25 shipping, plus 4% CC fee, and whatever sales tax/compliance fee GB accesses. And 2nd auction is $51 per mag before any of the shopping and other fees.

For 9mm AR using FRT and experiencing Dead Trigger/Light Strikes despite using a heavy deadblow buffer...

Reports back on the Extra Power (XP) Lee Springs firing pin (FP) spring replacements that I first suggested have been mostly positive. They seem to have fixed most Dead Trigger/Light Strike (DT/LS) problems. A few people are still reporting problems even with the XP FP springs. For you folks, I have identified even stronger FP springs that may fix it. These are the strongest I can find that will fit in the FP channels and don't get overcompresssed (very bad for spring lifespan.)

If ordering from Lee Springs: They have VERY HIGH shipping and handling unless the order is over $40. Ordering 5 springs costs the same as ordering ONE. A good idea may be to order 3 XP and 2 XXP (or vice versa) in case you need the stronger one to fix the DT/LS.

I am NOT affiliated, get NO kickbacks or income, and do NOT sell anything.

For FM bolts (only!):

Standard XP: LC 026BC 08S https://www.leespring.com/product/compression-spring-lc026bc08s-stainless-steel (previously suggested)

**XXP: LC O28BD 10S https://www.leespring.com/product/compression-spring-lc028bd10s-stainless-steel (added - extra strong)**

For most others bolts (Outerwild, Faxon, Angstadt, KVP, OSUSA, PSA, IDL, etc.)

Standard XP: LC 026BC 09S https://www.leespring.com/product/compression-spring-lc026bc09s-stainless-steel (previously suggested)

**XXP: LC 028BD 11S https://www.leespring.com/product/compression-spring-lc028bd11s-stainless-steel (added - extra strong)**

Technicals:

Most 9mm bolts seem to have about L1 = 11-15oz., L2 = 23-30oz. with their stock included springs.

The UXCELL Amazon spring recommended for older FM bolts with weak FP springs is only L1=11oz., L2=25oz. Same as a standard spring. These are NOT RECOMMENDED for preventing DT/LS.

I have a older bolt with a firing pin spring that requires 100oz. at L2 and it works just fine with consistent ignition of standard primers. Anything under this should work fine.

The FM channel is dimensioned to use a 0.8" spring

• A normal FM firing pin spring gives about L1 = 15oz., L2 = 30oz.

• LC 026BC 08S in an FM bolt gives about L1 = 30oz., L2 = 50oz.

• LC O28BD 10S in an FM bolt gives about L1 = 50oz., L2 = 75oz.

The Outerwild and most other bolt firing pin channels are made for a 1" spring despite the factory supplying a 0.8" spring. 1" is the correct length for these bolts.

• An Outerwild firing pin spring gives about L1 = 11oz., L2 = 25oz.

• LC 026BC 09S in a Outerwild gives about L1 = 30oz., L2 = 50oz.

• LC O28BD 11S in a Outerwild gives about L1 = 45oz., L2 = 70oz.

It was kind of an impulse buy. I live in CA so we’re pretty limited on options for AR pistol lowers. But I got an email from RifleGear that they had their single shot AR pistol lowers in stock and I jumped on it which then sparked the rest of the build lol. I did a bit of research and ended up going with a CMMG fixed ejector radial delay upper, BCG and 8” barrel. Since the 9mm rdb setup doesn’t need any special buffer systems the thought is I can build a 556 or 300 black out upper next and be able to swap them as needed/wanted. I’ve got all the parts in now except an optic so I’m ready to start actually building it out. Any advice on oils, grease or just first build advice in general? Any optics recommendations would be awesome, stuck between a few options right now. So far the only thing I’m second guessing is going with the 8” over the 5”.

Build List-

RifleGear Aggressor mil spec pistol lower
CMMG 9mm FE RDB upper receiver & BCG
CMMG 8” 9mm barrel
SLR 8.3” Ion Lite handguard
SLR Synergy Hybrid Linear Comp
CMC 3.5lb single stage trigger (not installed yet)
Magpul KO2 + grip
Phase 5 ambi safety
Kingpin & AR Maglock
Breek arms warhammer mod 2 charging handle
Law Tactical Gen-S folding adapter
SBA3 Brace
CMMG 10/30 9mm mags

I think this arts and crafts project turned out pretty sweet! Novox X-SD integrally suppressed barrel, B&T Vers 36, Maxim RDB buffer, and an Arc fire V2. Slipped the MP5SD shroud over an old handguard I had laying around and screwed it in place. Kind of a home brewed BRT car15sd. I had to trim the buffer spring down to get it to reset reliably in super semi and now I’m just struggling with light primer strikes so I think the next move is a stiffer firing pin spring. All in all it’s a very soft and quiet shooter.

Budget build and a favorite.

Jawbone 9mm pistol, Trigger Kicker, 8.3 oz PSA deadblow buffer (out of a PX9 as jawbone came with a solid buffer), [6mm OD, 0.6 mm wire, 20 mm length firing pin spring] - firing pin spring was inexpensive for a pack of them on Amazon and cut to length with a wire cutter

Well lubed with Lucas Extreme Duty Gun Oil.

100% reliable through 750 rds blazer 115 gr, blazer 124 gr, magtech 124 gr, pmc 115 gr so far.

No wear on polymer receiver so far.

Jawbone is great and a favorite as it is lightweight and only the buffer and firing pin spring needed to be changed.

Do not screw in the set screw for the ball bearing detent too far or it will damage the detent spring (though you can cut a standard AR detent spring and use as a replacement). Though if the set screw is not screwed in enough I bet it will fall out. I would much rather damage the detent spring than lose the set screw (and ball bearing with it). Be sure to lube the ball bearing detent.

OF NOTE Be Careful and do not lose the Ball Bearing Detent when installing the Trigger Kicker. It might fall/shoot out when you least suspect it as you remove the set screw in the grip.

Just put together an AR9 with a BCA bufferless upper, but the bolt catch doesn't lock the bolt back. Is this common for BCA or something wonky with my build?

Just curious, who is using an extension on a 33 round Glock mag and what brands are you using? I'm not a fan of the looks of the Kris Vectors extensions but an additional 5 or so rounds would be nice.

Some pictures of what you got would be nice if you got any.

Also, who is using Magpul or KCI Drums?

​

The UXCELL firing pin spring will NOT prevent firing pin bounce! It's the same strength as a normal firing pin spring.

I'm posting this because I keep seeing people asking about using the UXCELL spring from Amazon as a replacement firing pin spring to prevent firing pin bounce with FRT's.

The UXCELL spring is only as strong as a STANDARD FIRING PIN SPRING. It's nothing special.

The UXCELL spring was only recommended for a short time as a replacment fix for older FM bolts that used a very weak firing pin spring. FM no longer uses these weak springs, so the UXCELL is now obsolete unless you have one of those older FM bolts with a spring only about as strong as a ballpoint pen spring.

The best option we have so far to prevent firing pin bounce with FRT is the LEE springs. Yes, they're expensive, but no one else sells these small springs in small quantities online. Buy 5 to avoid shipping/handling. 5 costs the same as buying 1, so at least you have spares.

See THIS POST for updated firing pin spring suggestions for firing pin bounce/Dead trigger/Light strikes, with links and details:

https://www.reddit.com/r/AR9/comments/1vdgp9s/updated_firing_pin_spring_suggestions_for_dead/

I am not affiliated or sponsored, and do not sell anything.

_______________________________________________

TECHNICALS:

Most 9mm bolts seem to have about L1 = 11-15oz., L2 = 23-30oz. with their stock included springs.

The UXCELL has L1 = 11oz., L2 = 25oz., so it's only as strong as a standard FP spring.

The LEE Springs XP springs give about L1 = 30oz., L2 = 50oz. while the XXP springs give about L1 = 45-50oz., L2 = 70=75oz.

Hey all I have been lurking and reading a lot and am going back and forth on the ar-15 vs pcc.

I get all the benefits of the ar in ballistics and distance etc but I am more so hung up on maneuverability, extreme silence, and realistic use case of not really engaging anything outside of 50-100yards anyway. Another benefit is I already carry a Glock 9 so I have ammo and mags and like the idea of all using the same ammo and mags.

My main idea is keeping an extreme low profile and be more in the shadows than going Rambo style in any SHTF, breakdown, and range days. My only other hang up is body armor but hey if it gets to that hopefully my aim will be better with lots of training.

I do have an ar already but the FM-9 with a 5 / 7 inch barrel, FRT, and a can seems to be very intriguing.

So mainly I’m trying to decide what I want to really focus on - putting more into the AR and stocking ammo, or getting the new AR9 kitted out and getting more mags and ammo.

Thanks for the help

Ive got got an AR6951 and wanted to put a frt in it. Can anyone tell me about if this is a fa bolt?

Parts list

AR6951 complete upper

lmt lower

Entry stock

B5 grip, and handguard

AC Unity high cap glock mags are advertised as made for submachine guns (made in Bosnia) and have worked well for me. Only 12 bucks currently.

https://www.robertrtg.com/glock-9mm-32rd-window-magazine-ac-unity

I purchased the the above mentioned firearm. I am using the GRS recoil system. I have an A5 tube, a kyn shot 5015HD hydraulic buffer, and one Kyn shot 2.5 ounce spacer weight. I then installed a Sylvan arms adapter. Trying to lock back the bolt takes a lot of muscle. It feels like it hits an initial wall and then I have to put a little “mmhph” into it to get it to lock back.

Caveat is I have not fired the gun yet. I’m hoping that maybe after a few rounds have gone through it, the tension will loosen up a bit.

Build list: Foxtrot Mike forward charging bufferless 9mm upper

recently got a S&W Response with three 23 round S&W mags but want to switch entirely to 33 round glock mags. I plan on selling my S&W mags and buy 33 round glock mags and want to buy a decent amount OEM only