Changing rails and add-ons on the SPR Mod 1 is as easy as turning a torque wrench, according to ArmaLite. Posted: 2/1/2015 9:32:07 PM EDT Quote History. The mod 0 has a much more distinctive look, which I prefer. The original AK-47 was built to use this cartridge. Posted: 2/1/2015 9:02:29 PM EDT The M15 is like a regular Ar with round hand guards and A2 front sight. The Armalite SPR mod 1 has a quad rail monolithic upper. The ArmaLite ran without a hiccup, with the only stoppages being the ones that I intentionally induced by inserting a dummy round. The SPR MOD 1 is interesting and I do like ArmaLite (and even built one as a basic carbine) but I also have to say Colt. It is also about a pound heavier than the mod 1, as mentioned above. Special Purpose: ArmaLite also offers the ArmaLite SPR (Special Purpose Rifle) Mod 1 mid-length carbine featuring a monolithic-rail upper, which means the forend and receiver are machined from a single piece of aluminum so that flex between the two parts is decreased, and day and night optics can be mounted on the same plane. 5.2 RECEIVER FIT The SPR Mod 1™ is not a custom firearm. 5.3 APPEARANCE The ArmaLite SPR Mod 1 is a kit that contains a true one piece upper receiver manufactured from a single 7075 T6 aircraft aluminum forging. So what makes an SPR Mod 1? ArmaLite® requires a close fit between the receivers, but normal forging and machining variations may result in play or slight side to side receiver mismatch. This is not a manufacturing defect and has no adverse effect on accuracy. The ArmaLite SPR Mod 1 is a collaboration between ArmaLite and Aero Precision, with Aero performing most of the design and tooling. The SPR Mod 1's one-piece construction also offers a continuous optic platform (COP). ArmaLite’s SPR Mod 1 7.62X39mm provides all the flexibility of the Mod 1’s one piece upper receiver/rail system but now for the world’s most available cartridge. CDNN sells the SPR Mod 1 as an "M15". This rifle is known as the ArmaLite Defensive Sporting Rifle 10, or ArmaLite DSR10, or ArmaLite DEF10, and in California as the ArmaLite SPR Mod 2A. The gun has a nice feel and the solid rail system/upper receiver is a definite plus. There's no gap to bridge between the receiver and upper rail when installing a scope or sights. Re: Mk12 Mod0 vs, Mod1 To me, the mod 1 looks a lot closer to an M16A4 with a scope. The ArmaLite SPR Mod 1 LE carbine is a solid, well-built carbine that brings the story of the AR-15 full circle. Still when you compare the parts, there is a difference. The Mod 1 6.8mm is built with the ArmaLite-developed mid-length handguard and gas system to provide the best in form and function. Armalite "Special Purpose: ArmaLite also offers the ArmaLite SPR (Special Purpose Rifle) Mod 1 mid-length carbine featuring a monolithic-rail upper, which means the forend and receiver are machined from a single piece of aluminum so that flex between the two parts is decreased, and day and night optics can be mounted on the same plane. But none of that is rollmarked anywhere on my rifle; instead AR-10A is stamped on both the lower and upper receiver. However, weight in a precision type rifle is not nessesarily a bad thing, unless you plan to be hauling it all over kingdom-come. Armalite has issued a "Notice of Potential Safety Issue and Recall" for Armalite Models AR-10, SPR MOD 1, SPR MOD 2, M15 and Eagle-15. Even though I didn't know Colt had a monolithic upper! 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