r/AR9 is a subreddit with 33k members. The community frequently discusses ar9, build, trigger, lower, and cmmg, and they frequently recommend/review muzzle device, pcc, and chest rig, and the most common flair used is eye candy, part compatibility, troubleshooting, radial delay, and pre-build review.
A place to discuss variants of the AR series that are chambered for pistol cartridges, including 9mm, .40S&W, .45ACP, 10mm, and 22LR.
Popular Topics in r/AR9
#1
Ar9
12 posts
#2
Build
5 posts
#3
Trigger
5 posts
#4
Lower
3 posts
#5
Cmmg
3 posts
#6
Parts
2 posts
#7
Eddy Current
2 posts
#8
Host
2 posts
#9
Sights
1 post
#10
Stern
1 post
Products Discussed in r/AR9
Muzzle Device
12 reviews
#1
Kaw Valley Precision
4.5★ from 2 reviews
#2
Mach 3
4.0★ from 1 review
#3
Bixler
4.0★ from 1 review
Pcc
9 reviews
#1
Mach 3
4.0★ from 2 reviews
#2
Energetic Arms
5.0★ from 1 review
#3
SLR Synergy
5.0★ from 1 review
Chest Rig
7 reviews
#1
Spiritus Systems
4.5★ from 2 reviews
#2
Haley Strategic
4.0★ from 1 review
#3
Chicom
4.0★ from 1 review
Flair Used in r/AR9
#1
Eye Candy
: "Tucked or untucked"
14 posts
#2
Part Compatibility
: "EPC9 lower with Foxtrot Mike Glock mag upper mods"
6 posts
#3
Troubleshooting
: "Magazine springs?"
5 posts
#4
Radial Delay
: "From an AR15 - This:"
3 posts
#5
Pre-Build Review
: "Website says PSA Can't Guarantee Function With EndoMag 9mm Magazines but has anyone used this upper and lower with them?"
2 posts
#6
Roller/Bearing Delay
: "Best Roller Delay Options in 2026?"
1 post
#7
How To
: "Gentle recoil system and Tailhook Mod 1c"
1 post
Member Growth in r/AR9
Yearly
+6k members(21.7%)
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11.3% / yr
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8k members
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About
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Last updated: November 7, 2026