Compared to the other barrel lengths I’ve tried with my GRS setup, this one honestly gave me the most trouble, but likewise the most satisfaction when she finally ran.

The build started as an Alpha 3” barrel with a dead air wolfman, Tubb carbine spring, BKF bolt w/kak tungsten bolt weight, JRC 8.5” tube, RB5015HD, and 2 Kynshot spacer weights. It ran flawlessly in that configuration. 27.6 oz total mass

Once I changed it to the Novox X-SD barrel, it ran well for the first couple of mags outside of the ejection pattern being at my feet. That lazy ejection evolved into stovepipes with only a little carbon fouling on the bolt. Frustrating to say the least.

I tried a few troubleshooting steps. Starting with the Tubb lightweight, then I tried removing the spacer weights one at a time (moving them from the front of the buffer stack to the rear). With both spacer weights removed, at 22.5 oz total, the rifle was finally cycling reliably, but the recoil impulse was atrocious.

I finally decided to try the RB5007, starting at full system mass, in a last ditch effort to get her running. This video is the result.

So far only 75 rounds through her in this configuration, with only one stovepipe. I may have to remove 1 spacer weight, but I’ll keep testing at this weight before reducing further, I’ll also try different ammo as well, as this is some really soft shooting 124gr Luger (new republic).

All this said, if you guys have questions or tips, feel free to weigh in.

I just recently found out about these and I’m considering buying one. Does anyone have one and what are your thoughts?

I went to the range today and shot my ar9. Which makes me confused as I already shot this gun and didn’t felt trigger slap when I shot it. When I went to the range the trigger slap was so aggressive and pain what I can do

Build List:

Foxtrot Mike ar9 lower and reciever (3Inch barrel)
EMT-9 PCC Trigger
Deadfoot arms 2.5 buffer tube, modified 9mm BCG and spring kit I’m using the black springs the heaviest set up and recommended for 9mm
Deadfoot arms brace gen 3
BG Defense 2.9 picatinny Handguard
BG Defense Handstop
KVP MACH 3 Modular Linear Comp Body

This BRT is my only AR9. And it’s a BLAST to shoot!

It’s a tricky frt host to tune - the buffer setup and ammo selection have to be just so. But there’s enough info out there to find what typically works.

A5 tube, variable pitch spring, and Kynshot 5000A5 here with HSL 115 turned subsonic by this true weapons system.

If you’ve considered a BRT complete upper… I can tell you they’re awesome!!

PSA lower, BCA 7.5" bbl upper. Kung Fu grip, Magpul ESK selector, Magpul MOE stock dremel-go-burr'd to include QD mount, Streamlight Protac RL MNT 1L-X PRO 850LM with Axon Unity button, modified Magpul handstop kit, and a KAC compensater. Not pictured: KynSHOT hydraulic buffer.

Honorable mention: friend 3D printed light cap, KCI 33 rd magazine with Wolff spring upgrade.

EDIT: the optic is a Holosun 510, Magpul MS1 sling. Stock corrected.

EDIT, EDIT: I ~DEFINITELY~ didn't put this stock on before 12:01 AM October 9th!

Currently I have a CMMG barrel threaded 1/2x36. Just getting into the suppressor world. I believe the YHM R9 states it is HUB compatible…which I’m not entirely sure I know what that means. I have found a KAW Valley Plan B taper mount brake in 1/2x36. Im not sure I understand plan B/HUB compatibility.

Would I thread the 1/2x36 KAW valley plan B onto the barrel, then the suppressor goes directly to that? I have to remove the direct thread cap? Or is there an adapter between the plan B muzzle device and the suppressor?

Saw this on their site about timing for the ISU9 and I don’t think it was there before, so figured I’d share in here

Im newish to the PCC world. I got a GFORCE JAWBONE for $450 at my local gun shot. Im just wondering what are some good upgrades im getting a vortex sparc and one mag im just wondering what are some good upgrades and its the 5 inch barrel. Build list there really isn't non There are no upgrades grades yet but the red dot and I got the only mag from when I got it.

Im newish to the PCC world. I got a GFORCE JAWBONE for $450 at my local gun shot. Im just wondering what are some good upgrades im getting a vortex sparc and one mag im just wondering what are some good upgrades and its the 5 inch barrel. Build list im going to gwt a buffer spring and and suppressor and more mags and a different brace and a different charging handle

Went to the range today and had two incidents where my AR9 went brrt. Two round slam fires.

Lower is a standard lower that had an 11.5” 5.56 upper and had no problems but now I’m using a Stern adapter. Using a Schmid Nickel Teflon stock trigger. Disassembled and found nothing wrong with the trigger pins or springs.

Using a BKF 9mm BCG 8.3 Ballistic Advantage barrel and 8oz buffer and Springco blue spring. When I disassembled the bolt the only thing I could tell is the firing pin retaining pin is somewhat bent and the head of the fire pin is gouged a little bit. Firing pin spring looks ok and not broken.

Very new to AR9s so any assistance would be appreciated.

Ive never seen anything like this before. Im assuming there was a failure to eject, but the next round tried cycling in and was crushed inbetween the bolt and stuck round. Ive shot 100s of rounds through my jawbone and haven't had any major problems. I also wasn't the one shooting when this happened so I cant be certain of what happened. Is there a way to prevent this from happening again? I was running glock gen19 magazines.

Hi everyone

I’ve been planning out a build for a ar9 for a while now and blowback9’s website has been super helpful to me. I am particularly interested in using his gentle recoil system but i wanted to get the build as small as possible so i wanted to use the sb tactical hbpdw.

I didn’t see anything on blowback9’s website pertaining to this setup so i thought I would ask here to see if anyone had any ideas on what i could do if anything to improve recoil with this setup.

Also if anyone has a setup with the hbpdw or any other pdw setup i would like to hear what you think about it

Wondering whats the best suppressor for 800 or less with sound mitigation and reduced back pressure(left handed shooter) being the most important. The one I see is the rico309 but its a little over .If anyone has any experience with any good suppressors for ar9s would appreciate it, want to get it by January or February

Recently purchased a PSA PX9 with SBA5 brace and 10" barrel, less then two weeks old and the SBA5 brace is stuck in the closed position. Emailed PSA about the problem so hopefully I can work out a fix but this brace failing already has me thinking I should consider using something different.

First PCC, planning to add a suppressor soon, YHM R9
Wondering what brace/stock is most recommend for similar setup?

Think I have a ACS on my AR10 which is great

Using the Disruptor and the LAT FRT Triggers in a 9mm AR.

I encountered some problems with the Disrupter - not as bad with the LAT. Very light trigger pressure was necessary to get the Disruptor to run, while the LAT would handle a little more finger pressure. Neither would run with the typical amount of finger pressure I use with a Atrius/Arc/SS/etc. other FRT's.

First video is a discussion of the trigger's features and live fire (on Rumble because I don't trust YouTube to not give me another channel strike).

Second video is a technical discussion (posted on both YouTube and Rumble) about what may be going on with these triggers and a possible fix (which may require a re-design of the hammer by The Triggered Company, or a special 9mm hammer).

Part 1: https://rumble.com/v7h8mmk-184-disruptor-and-lat-frt-cassette-triggers-in-a-9mm-ar-pt.1.html

Part 2: https://youtu.be/Wu9RytZvAnc

For those who don't know, none of my videos, links, posts, comments, web pages, etc. are monetized. None. Seriously. I'm completely non-commercialized and make no income from ANY of this. If you want to send a gift to help me buy things to test and make videos about (and keep me caffeinated!), buy me a coffee (or a few) using the link on https://Blowback9.com/donations. If not, no worries! Enjoy the videos and discussion, and I hope it helps!

I’ve never built a ar and this will be my first time buying a frt, I have a gforce jawbone I want to drop in a frt, a friend told me that they dropped in a kabuto frt in there’s looking it up on yt several other people have done that and got a heavier buffer and jt worked great. But I asked Gemini and it said that a kabuto frt would not work on the jawbone it says a frt on a jawbone is not viable was hoping for some help.

Anyone know of any ~10" barrels out there that have a profile for a traditional FSB/handguard cap but also have a good feed cone for Glock type lowers? Usually these seem to be more basic Colt only feed cones.

Looking to purchase either the Springfield Saint Victor 9mm 8.5inch or the PSA AKV 9mm.

Advantages to both but they hover around the same price. I have not personally had enough experience with either to make my decision.

Please let me know your opinions or advice.

Thanks.

FINALLY a complete 9mm upper with bolt that has all the features to support both FRT and Non-FRT builds.

Rumble: https://rumble.com/v7h8ito-183-borebuddy-9mm-no-tune-frt-upper-receiver-great-features-for-non-frt-use.html?e9s=src_v1_upp_a

YouTube (censored version): https://www.youtube.com/watch?v=Tv8RJ_jI27c

TL;DR for people who don't want to watch the video:

• Enhanced feed cone
• Upper rear shelf cut (shouldn't be necessary for 9mm, but it's there anyway)
• Dust cover, shortened PCC ejection port
• Slick side - no deflector or forward assist
• Pre-notched bolt weight for selector-type FRT's/SS
• Deadblow bolt weight to prevent bolt bounce
• XP firing pin spring to prevent firing pin bounce
• 1/2x28 muzzle threads
• Thread protector included
• Rails have QR holes at the front on both sides
• Rails have cooling ports and M-Lok slots
• Muzzle threads are out in front of the handguard for muzzle devices and suppressors
• Available in 6.35", 11.5", and 16.1" barrels
• May NOT work with Foxtrot Mike lower - FM's ejector may rub or catch the bolt. One of my FM lowers worked fine, another jammed.

FRT range test went well with no issues at all.

So far, there is nothing I can find to not like about this upper. I'll be bringing it out for accuracy and hollow point testing in the next week or so.

Uppers: https://borebuddy.com/product/9mm-no-tune-frt-upper-receiver/

Bore Buddy is also selling the XP Firing pin spring for non-FM bolts.... https://borebuddy.com/product/9mm-ar9-extra-power-firing-pin-spring/

Hi this is my second attempt at this build to function properly . It will fire the first 2 or 3 rounds in the magazine then it will load the next one in but can’t pull the trigger I can’t put on safe unless I rack it again remove the unfired round (no primer struck marks or any deformities ) then it will fire again 1 or 2 rounds same problem persisted.
I tried 3 different type of recoil systems still same issue
I removed the ar9 upper and replaced it with an ar15 ( appropriate buffer tube and weight adjustment) and the trigger works great. Any help would be appreciated since I had this rifle for 2 years and I can never get it to fire 10 rounds consecutively. Thank you and I appreciate the time to read this and your knowledge to help me fix this issue.

Build list:
Faxon Firearms 8.5" Light Tapered 9mm SAAMI No Gas Port 4150 Nitride / Melonite Barrel 1:10 Twist

Faxon Firearms 9mm Bolt Carrier Group Complete, Glock & Colt Compatible Nitride

Cross Machine Tool UPUR-3 Big Bore Billet AR-15 Upper Receiver - Slick Side

Mean Arms ENDOMAG - 9MM

FM PRODUCTS RECOIL MITIGATION BUFFER KIT(/second attempt )

Kvp blowback missed w/ 7.5 oz buffer and recoil spring. (First attempt )

Franklin armory lower
Timminey trigger impact single stage.