Mega Machine Shop AR-15 GTR-3H 5.56mm 16″ Semi-Auto Rifle Geissele AimPoint
SOLD FOR: $1,276.00
LSB#: WY250406WP003
Make: Mega Machine Shop Inc.
Model: AR-15 GTR-3H
Serial Number: MBM0150
Caliber: 5.56 NATO / .223 Remington
Action Type: Semi-Automatic, Direct Impingement
Barrel Length: 16″
Sights / Optics: This rifle is equipped with an Aimpoint Comp M4 red dot optic paired with a flip-to-side 3x magnifier, both mounted in high-quality LaRue Tactical mounts. The system offers rapid target acquisition at close range with the ability to transition quickly to magnified aiming for medium-distance precision.
Stock Configuration & Condition: The rifle features a Magpul UBR Gen 2 adjustable stock, offering rugged performance with minimal wobble and excellent cheek weld. The pistol grip is an ergonomic rubberized Hogue grip for enhanced control. There is also a vertical foregrip attached to the quad rail handguard. The furniture is in Excellent condition with minimal signs of handling.
Type of Finish: Matte Black Anodized
Finish Originality: Original
Bore Condition: The bore is bright and sharp with no visible erosion or fouling. In this writer’s opinion, the bore rates 10/10.
Overall Condition: This rifle is in Excellent condition. The finish shows only faint evidence of handling. All markings are sharp, and the rifle appears to be professionally assembled with premium components. There is no sign of abuse or excessive use. This rifle retains about 98% of its finish overall.
Mechanics: The action cycles smoothly, and the safety selector, bolt release, and magazine release all operate as intended. The rifle is equipped with a Geissele SSA two-stage trigger, known for its crisp break and reliability in duty and competition use. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.
Box, Paperwork & Accessories:
This rifle comes equipped with:
- Aimpoint Comp M4 red dot sight
- Aimpoint 3x magnifier
- LaRue Tactical quick-detach mounts
- Young Manufacturing chrome bolt carrier group
- Geissele SSA two-stage trigger
- Total of 3x 20rd Pmags in Very Good – Excellent condition.
Our Assessment: This is a superbly built AR-15 based on the renowned Mega Machine Shop GTR-3H lower receiver, known for its tight tolerances and premium finish. The addition of a Centurion Arms 16” barrel and Young’s high-quality chrome bolt carrier group further elevate this rifle’s performance. It’s been thoughtfully outfitted with top-tier components including a Geissele SSA trigger and full Aimpoint optics suite, making this a complete turnkey solution for tactical, duty, or competition use.
Whether you’re looking for a no-compromise fighting rifle or a dependable optics-ready platform, this rifle delivers serious value. The high-end build quality and optics setup alone make it a standout in any AR collection.
A well-executed build with top-tier parts from Mega, Geissele, Aimpoint, Centurion, and Young Manufacturing—this rifle is more than the sum of its parts. If you’re after a premium AR that’s mission-ready out of the box, don’t miss this one. Please see our photos and good luck on your bid! – L.S.
