Palmetto State Armory PA-15 M4 Carbine Quad Rail 5.56 NATO Semi-Automatic Rifle – 16" Nitride Barrel
The PSA PA-15 M4 Carbine Quad Rail pairs a hardened 16-inch nitride 4150 CMV barrel with forged 7075-T6 receivers to deliver a MIL-SPEC-grade AR-15 platform ready for duty or range use. Its carbine-length aluminum quad rail provides four uninterrupted 1913 rails for lights, lasers, or grips, while a Carpenter 158 bolt and 8620 carrier ensure reliable cycling. Made in the USA, this rifle offers a proven direct-impingement action in a compact, fully accessorized package.
Condition
Overall Condition: Excellent – shows only faint signs of prior use or handling.
Bore Condition: Excellent – clean, mirror finish, no signs of wear.
Bore Rifling: Excellent – sharp lands and grooves.
There are a few minor, superficial scratches and blemishes on the exterior surfaces.
What’s Included
- One 30-round Magpul PMAG 5.56 polymer magazine
The forged 7075-T6 upper and lower receivers meet MIL-SPEC dimensions and are finished with a durable hard-coat anodized black surface. The lower is marked “MULTI,” allowing caliber flexibility for future uppers.
A 16-inch M4-profile barrel, machined from 4150 CMV steel and nitride treated inside and out, offers corrosion resistance and easy maintenance. It is threaded 1/2x28 and capped with an A2 flash hider, giving buyers immediate suppressor or muzzle device options.
The 7-inch aluminum quad rail extends four continuous Picatinny rails for mounting accessories. An F-marked A2 front sight base provides a fixed aiming reference, while the flat-top upper is ready for the rear sight or optic of your choice.
Internally, the rifle uses a Carpenter 158 bolt and 8620 carrier, matched to a carbine-length gas system for smooth, dependable function. The direct-impingement action keeps parts common with most standard AR-15 components.
A 6-position collapsible stock adjusts for length of pull, and an A2 polymer pistol grip rounds out the controls. Overall length ranges from about 32 to 35.5 inches, and the rifle feeds from standard STANAG-pattern magazines, giving a 30+1 capacity in 5.56 NATO.