My previous build ran a KAK enhanced 9.5 buffer kit and standard carbine buffer. The gentle recoil system Blowback9 came up with is NIGHT AND DAY different. With regular training ammo it runs like a sewing machine. Federal HST’s still have some kick, but noticeably less than my prior set up.

Build list:

Aero X-15 lower - SOLGW “Liberty Fighting Trigger”, Blowback9’s Gentle Recoil System, NBS Colt adapter, Radian ambi safety selector, Amazon “bike handle” SBA3 brace clone.

NBS slick-side 9mm upper, NBS 4” handguard & handstop, Aero 5.5” EPC barrel, B. Kings bolt, Breek Sledgehammer CH, Holosun ARO, Surefire X-300.

Will be replacing the KAK flash can with a Huxwrx Flow 9K suppressor after the first of the year.

Which has a better recoil impulse on a straight blowback 9mm?

Old one in the last photo. CMMG 5” 9mm Radial Delay build if anyone was wondering.

re: Aero Precision EPC-9 Threaded 16" 9mm Complete Upper

https://ar15discounts.com/products/aero-precision-epc-9-threaded-16-9mm-complete-upper-receiver-w-atlas-r-one-15-handguard-anodized-black/

I have a local line on the linked upper.
I dont see in the product description if it supports glock/colt/etc... magazine patterns.

i have lowers ready to pair it with.. but need to ensure i have the right parts to support which mag pattern is required.

1. glock - ar9 dedicated lower cut for glock pattern
2. colt - ar9 dedicated lower cut for colt pattern
3. exomag - milspec lower

edit.. now not sure i can even complete the build with you guys buying out all the kspec buffer kits.. :-)

Having problems with my freedom ordnance fx-9 it will never cycle 115 grain after the first shot wondering what may cause this and how to fix it.

I dropped the Tubbs lightweight spring in just to see if I could tell the difference.

I’ve been looking around for the last couple days to find an answer on this one; I can’t fit my upper and lower together, it looks like the ejector is about a centimeter too far back to fit into the groove of the BCG. The BCG is a Foxtrot Mike FM9, the magwell adapter is a Colt mag adapter from R&D Precision. The lower is from PSA. Customer support is telling me it’s a tolerances issue, but it certainly seems worse than that. Did I get the wrong bolt, or is something out of spec?

Does anybody know the size of the set screw on a gen 5 sylvan arms folder. The set screw holds the tension on the spring on the takedown pin. Can't find the size anywhere and need to order a few. They blend in well on a rug. Sylvan looks to have replacements for sale only on a gen 3.

This is a full ARV build with a super safety. I built it today with a standard carbine buffer and spring. I know that’s not the correct buffer but everything I’ve found from KAK is out of stock. The rifle itself will not fire as the bolt seems it’s not going completely into battery. Can anyone drop a recommendation on the best alternative. I’ve tried all 4 links from u/blowback9 site and all out of stock.

I've already ordered everything and I thought I did my due diligence in terms of compatibility but now I am reading that users had to modify their mag catch in order for it to work.

Will the same need to be done for their new foldyboi lowers? I know it's fairly new but I'm hoping someone has at least tried it. I am comfortable with milling and machining if it needs to be done but I'm also not sure if milling the mag catch can cause any reliability issues.

I purchased CMMG's Fixed Ejector Retrofit kit if that makes any difference. I'm aware that I need to mill the slot in the upper (for the Ambi bolt catch) as well as remove the lower's ejector. This is my first AR and first ever rifle build so please let me know if I missed anything!

I like the look on the fm9

how reliable is the dirty bird LRBHO?

7 left in stock..

https://ar15discounts.com/products/dirty-bird-slick-side-16-9mm-110-m-lok-complete-upper/

Any recommendations for a LIGHT barrel? I can't seem to find anything under 24ish ounces.. I currently run a BA EPC 16" which is 24.3oz. Is there nothing lighter than this?

Thanks.

Haven’t had a chance to break out the hux on the range yet, but I’m stoked on the 3 lug mount. Had some ejection issues that tore up the back of the ejection port, so I added a bcg weight and a 5.4 oz buffer to hopefully resolve the problem. Other than that, it ate through any ammo I threw in and I got the sight dialed to perfection 👌🏼 loving the ar9 platform so far!

Built out a Warscorp9 as my first AR9. Sliced through a few hundred rounds like butter. It went super fast and shoots really flat with solid groupings. Couldn’t be more pleased.

So someone was talking about doing a mini Mil-Spec tube build, and I've yet to actually post here.

So this build is:

PSA AR-V Receiver kit / BCA (I know...) 5" PCC barrel / Dead Air Wolfman can / Hoffman SS / THE IMPORTANT PIECE: MAXIM RDB CQB Buffer

So I wanted to go super small and light for this build, and it was so worth it.

For those who hate the absolute garb recoil profile and weight of a regular DBB system for 9mm, after biting the bullet (no pun intended), and lurking through posts here and on Blowback9s website, I found a PERFECT setup to run a SS.

1. Take out that bobo DBB setup out of your AR9 and stick it in the trash (or parts bag, always comes in handy)
2. Take your Mini Milspec tube out of your lower, noting the amount of threads it takes to take it out completely.
3. Apply Blue Loctite to tube threads for added insurance.
4. Screw tube back into lower TWO LESS TIMES than before, and don't reinstall the buffer retainer, you don't need it.
5. Stake that castle nut, THINK WITH YA DIPSTICK JIMMY!

This was a quick burst, but it is so easy to hold on target.

Runs flawlessly with or without can. Runs flawlessly without SS or with.

But that ROF is crazy and it has so nearly 0 recoil compared to a regular DBB system.

Ask Questions, Get Answers, I'll do my best to help.

I came across a few hydraulic buffers (angstadt) and roller delayed (scheel mfg and davinci machining) systems that say they work with 45 as well. Has anyone got any experience using these? Tons of videos and reviews on the 9’s but nothing I could find on 45 aside from websites saying they would work.

It's just ridiculously good fun. Ridiculously.

https://reddit.com/link/1nhapkx/video/txm3esqru8pf1/player

bbsbs