Unfortunately though sometimes the best researched plans do not uncover shortcomings of the AR and in this case the 9MM AR. The quickest way to find problems with a weapon is to simply shoot it and shoot it a lot. The purpose of this page is to aid you with 9MM AR troubleshooting.

Nov 12, 2022 · Highly recommend an Extar EP-9. I have two coworkers who bought PSA AR9's and one runs fine and the other runs like garbage. I've had a PSA AR9 lower since it was released and mine took some fine tuning; I have a custom built upper though. I used a standard carbine buffer with an AR10 buffer spring and a buffer spacer. Mine shoots everything now.

Jul 20, 2020 · Try loading your mags only halfway to like 60% cause it might still be in a “break-in” period. I have an FM9 and it’s suggested for the first 500 or so rounds to do so. Also, it might …

Jul 4, 2023 · There may be something wrong with the bolt catch installation, parts, or the catch itself. e.g. spring, detent, or some other problem that's preventing it from moving all the way up.

Jan 12, 2022 · AR-9 pistols can misfeed due to some minor breech face machining geometry shortcomings. This is 'Phase 1' in an effort to safely fix the problem.

Oct 7, 2024 · If you’ve been thinking about adding a 9mm upper to your existing AR and had hesitated not knowing what mag system to use, then definitely check out the ExoMag from MEAN Arms.

Aug 11, 2016 · Unlike most other AR-style 9 mm rifles, the AR9 has a last-round hold-open feature. Wilson Combat engineers were able to achieve this by designing a finger of steel that engages the...

Oct 2, 2024 · In this article, we’ll explore the most common AR-15 malfunctions, such as failure to feed, failure to eject, and double feeds, along with practical tips on addressing each one.

Mar 15, 2021 · Every 9mm AR you see on the market can trace its lineage back to the Colt Model 635 SMG – the granddaddy of sub-caliber ARs. But, the Colt SMG had its limitations and …

Aug 24, 2012 · The ejector is a sheet metal prong installed in this adapter. Occasional ejection problems can arise when the ejector becomes bent outward so ejected cases don't impact on the ejector face correctly as they are extracted from the chamber. This is an easy problem to solve.