Not just for a2s - UTG Pro AR15 Super Slim M-LOK 15in Drop-In Handguard

I recently installed one of these on a "mil-spec" carbine. Fit the A2 front sight perfectly. So I tried another one with Midwest Industries receiver height gas block with rail. Snapped in easier than the first. However, there is a 3/8" gap on the top between the front of the gas block and the handguard rail. So, even though I consider it cosmetic, the rail is not completely continuous in front of the block. These are kind of pricey, but if you catch them on sale, they're definitely a nice "drop in" option to other name brands that you have to take apart because of their proprietary barrel nut system. FYI - the pieces do not snap in under the end cap but rather seat around it. Skeptical at first because it comes in 3 pieces, but it tightens down nicely. Something different, and even though it feels solid, I don't know how it will hold up to heavy use.