YHM Lower Receiver
Rainier Arms Upper Receiver
Rainier Arms 7.5" Barrel
Magpul MIAD Grip
Magpul MS2 Sling
Matech rear BUIS
Midwest Industries front BUIS
POF roller cam pin
Adams Arms PDW length gas piston
Adams Arms Samson 4" Rail
Spike's Tactical ST-T2 Buffer
BCM Extractor Spring Upgrade
Ergo Grip ladder rail panels
GG&G Accucam Quick Detach
Trijicon Reflex RX-06
When I first put this together two years ago, I had trouble with extraction on my first range trip. AA customer service was very helpful in identifying the problem. After upgrading the extractor spring and adding the o-ring, it has run flawlessly for over 1000 rounds. I've shot various 55gr ammo out of it like Federal, PMC, AE, etc. I haven't shot much steel cased ammo out of it, because the range I go to doesn't allow bi-metal projectiles. I know there are a lot of people who are against piston systems on ARs in general, but find them acceptable when it comes to 7.5" SBR/Pistols.