Builder Armory

// Non-NFA Other · 9mm

GF-AA9

Angstadt 0940 / Foxtrot Mike 10" / 9mm pistol-caliber carbine

GF-AA9
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Rating
by G
Compatibility1 report from 1 person on this receiver combo
  • Minor issues · Magazine · Failure to lock back on empty (1 report)
See the reports for this combo →

First AR9 build. Angstadt 0940 lower paired with a Foxtrot Mike ultralight 10" barrel and a Holosun ARO EVO. Tuned for soft recoil with a KynSHOT hydraulic buffer and BattleSteel flat-wire spring. Running a KVP linear comp pinned & welded after initial testing.

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// Loadout

Equipment

SlotProduct
LowerAngstadt 0940 Lower Receiver
UpperAngstadt Pistol Caliber Upper Receiver
GripFortis Manufacturing Torque Carbon Fiber Pistol Grip
Vertical ForegripCustom 3D Printed Vertical Foregrip
HandguardCoda Lightning Carbon Fiber Handguard - Super Lightweight AR15 Rail
OpticHolosun ARO EVO - Gold Dot
RiserScalarworks 1.57" LEAP/01
TriggerRise Armament Rave 140 AR-15 Trigger - Flat Bow - Anti-Walk Pins
Bolt Carrier GroupKAK 9mm Enhanced BCG
BarrelFoxtrot Mike 9mm 10" Ultralight Barrel
Muzzle DeviceKVP Linear Comp - Black (pin & weld)
Charging HandleBreek Arms Warhammer AR-15 Ambidextrous Charging Handle
BufferKynSHOT RB5015HD Hydraulic Buffer
Buffer TubeJust Right Carbines Long Buffer Tube
Buffer SpacerJRC Rubber Bumper for Buttstock
Buffer SpringBattleSteel Flat Wire Buffer Action Spring
Buffer Spacer WeightsKynSHOT Spacer Weight 2.5 oz
Pistol BraceSB Tactical SBA3 AR Pistol Stabilizing Brace - Stealth Gray
Bolt CatchRadian Extended Bolt Catch
Takedown PinsRadian AR-15 Takedown Pins
Ambi SafetyRadian Talon Ambi 45/90 Safety Selector
LazerHolosun IRIS-GR1 Compact Green Laser
LightPROTAC® RAIL MOUNT HL-X LONG GUN LIGHT

// Build Log

Updates & modifications

No updates logged yet.

// Range Log

Training Sessions

2026-09-30TrainingNo Malfunctions

no issues, shot perfectly. used maxxtech 124 gr instead of S&B and had no issues.

248
rounds
124 gr
2026-09-18TrainingNo Malfunctions

buttery smooth. No issues or anomolies to report. The Cheap Lazer maintained 0. Upgrading to the IRIS GR1 next week.

314
rounds
124 gr
2026-09-15TrainingNo Malfunctions

flawless

314
rounds
124 gr
2026-09-14TrainingNo Malfunctions

rezeroed at 15 yards. I changed the mount for the reticle from tha At3 mount to the scalarworks. leap/01 mount directly mounted to the reticle. 3 shots and was zero'd perfectly. Also zero'd the cheap razor to the same 15 yards

165
rounds
124 gr
2026-08-24TrainingNo Malfunctions

Smooth as fk. The GRS is very nice to shoot with. I swapped the faxon handguard with the code because i like the look better. Also added the stream light from the GPC9 because this is my main and will be what i grab in case of emergency. Gun shot perfectly, no malfunctions or oddities. Still accurage. I did have to remove the barrell nut so a benched zero would probably be good but it was still very accurate from the previous zero.

363
rounds
124 gr
2026-08-06TrainingNo Malfunctions

Added the additional weights in the buffer to make it a full GRS buffer system. Ran very smooth. Re-zero'd the optic and practiced double taps at 15 and bill drills at 7. This is still my favorite build. I added some rail covers and a small handstop. The handstop is small and works very well. The rail covers are for aesthetic purposes.

248
rounds
124 gr
2026-05-11TrainingFailure to Feed

Added the Kaw Valley linear compensator with a pin & weld and this thing shoots beautifully. Only issue today was using Sig V-Crown, which did not feed. For self defense, Sellier & Bellot rounds will be in the magazine.

264
rounds
124 gr (Sig V-Crown)
2026-04-19TrainingFailure to Feed

Flat-nosed Winchester 115gr ammo is ass, never buy again. Flat face makes feed reliability bad. Otherwise smooth, very accurate, and a joy to shoot.

294
rounds
115 gr (Winchester flat-nose)
2026-04-13TrainingNo Malfunctions

Great shooting, soft recoil, easy to transition, trigger feels great. Love it.

302
rounds
124 gr
2026-04-12ShakedownNo Malfunctions

Shot beautifully, very little recoil, soft with the damper, very accurate.

200
rounds
124 gr