Armalite M-15 SPR Mod 1 5.56mm NATO Semi-Auto Rifle, 16-inch Threaded Barrel, YHM Diamond Free-Float Quad Rail, Ambidextrous Safety
This Armalite M-15 SPR Mod 1 stands out with a quality custom configuration that blends Armalite's proven AR-15 platform with practical upgrades. It features a YHM Diamond-series free-float quad rail, a flat-top upper with T-marked Picatinny rail, a 16-inch threaded barrel with an A2 flash suppressor, and an ambidextrous safety. The rifle includes a 30-round Thermold magazine, and the bore condition is excellent.
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: This firearm is in great shape. Minor scratches and blemishes are present.
What’s Included
- 1x 30-round Thermold polymer AR-15 pattern magazine
- Yankee Hill Machine Diamond-series free-float quad-rail handguard (installed)
- Polymer vertical foregrip (installed)
- Textured rail cover panels on the handguard (installed)
The M-15 SPR Mod 1 is built on Armalite's AR-15 platform with a semi-automatic, direct impingement operating system. The lower is marked CAL. MULTI and SPR MOD 1 with the ArmaLite Geneseo, IL roll mark, and the rifle is made in the USA.
The flat-top upper receiver provides a T-marked Picatinny rail, forward assist, shell deflector, and ejection port cover. Its 16-inch barrel is threaded 1/2x28 and fitted with an A2 flash suppressor.
A YHM Diamond-series free-float quad rail is installed, delivering a continuous T-marked top rail and labeled side positions (e.g., R16/R18/R20) with a visible YHM logo. The setup includes textured rail panel covers and a polymer vertical foregrip for added control.
Controls and furniture include an ambidextrous safety, a standard magazine release, a 6-position collapsible stock, and an A2-type pistol grip. The rifle accepts AR-15/STANAG pattern magazines and comes with one 30-round Thermold magazine for a total capacity of 30+1.




