Aero Precision M4E1 SBR .300 AAC Blackout with PWS MK109 Mod 1-M 9.75" Piston Upper, Geissele G2S Trigger, and JP SCS H1 Buffer
This Aero Precision M4E1 short-barrel rifle pairs an M4E1 lower with a Primary Weapons Systems MK109 Mod 1-M 9.75" .300 BLK long-stroke gas piston upper. It is outfitted with a Geissele G2S 4.5 lb two-stage trigger, a Geissele Super Charging Handle, and a Magpul adjustable stock wearing a Limbsaver recoil pad. The build features a PWS free-float M-LOK handguard with a continuous top rail and a PWS Triad 30 muzzle device, and it includes a JP Enterprises Silent Captured Spring H1 buffer assembly.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The firearm shows a few minor, superficial scratches and blemishes from light handling. Surfaces present cleanly with strong overall cosmetics.
What's Included
- Aero Precision M4E1 .300 BLK SBR with PWS MK109 Mod 1-M 9.75" upper (installed)
- 2 x 30-round Magpul PMAG 300 BLK polymer magazines
- Geissele Automatics G2S two-stage trigger (installed)
- Original trigger (in box)
- JP Enterprises Silent Captured Spring assembly, H1 (Installed)
- Limbsaver recoil pad (installed on stock)
- Geissele Super Charging Handle, ambidextrous (installed)
The PWS MK109 Mod 1-M upper delivers a long-stroke gas piston system optimized for .300 BLK in a compact 9.75" configuration. The upper is marked ".300 BLK" and wears a PWS free-float M-LOK handguard with a continuous 12 o'clock Picatinny rail for accessories. The threaded barrel is topped with a PWS Triad 30 muzzle device.
The Aero Precision M4E1 lower (marked "AERO PRECISION LAKEWOOD, WA") is finished in black hard-coat anodizing over aluminum receivers. Controls feature an ambidextrous safety selector. The charging system uses a Geissele Super Charging Handle for smooth, ambidextrous operation.
Fire control is upgraded with a Geissele G2S two-stage trigger set to approximately 4.5 lb. The package also includes a JP Enterprises Silent Captured Spring H1 buffer assembly, supplied Installed, offering a refined recoil system option for the buyer.
Furniture includes a Magpul adjustable carbine stock with a QD sling socket and a Limbsaver recoil pad, plus a Magpul MOE-K2+ pistol grip. Length of pull is approximately 11.5"–14.5". Detachable STANAG-pattern magazines feed the rifle, and capacity is listed at 30+1. Country of origin is the United States.