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I already had a 9" 300 BLK barrel, that is fantastic. But I was looking for another 300 BLK setup that could maximize the performance of supers, and still maintain subsonic performance. The 13.9 is a great option for this. Can pin/weld to 16" with several different muzzle devices, gives supers more velocity, and can still keep subsonic ammo below 1100 fps. Consider running a bootleg adjustable carrier to be able to tweak the gun to run sub's and super's without an adjustable gas block. That has worked really well for me with most 300 blk setups.
I found that Aero Precision is pretty much my “Go To” brand with AR parts. They tend to be the best option when looking to balance quality and price. BCM uppers have a slightly tighter fit of the barrel, but I’ve never seen a measurable difference in performance because of it.
Aero receivers are a great foundation for any build. Always had positive experiences with their parts.
I always wanted to build a Mod 0 SPR, so naturally this handguard was a no brainer. The handguard itself, and the lockup at the barrel but is incredibly robust. The long threaded barrel nut, the jam nut, the set screws that tie them all together, and then the continuous top rail make for a really rigid platform. Very impressed!
I was very impressed by how well this sight tool functioned, and the amount of adjustability it provides. It's surprising "solid" as well (I guess I set my expections low given the price). I've already used it on 2 Glock pistols, and I'm sure it will be used many more times in the future. Very happy with the purchase.
I was looking for a lightweight rail that was MLOK compatible, and would work well with an 11.5" barrel. This rail is exactly what I was looking for. The Gen III is an improvement over the Gen II, and the gen II's were great! Very happy with it!
Dot clarity is great, field of view is much improved over other micro dots, and it's priced very competitively for what it offers. There is a slight bit of distortion around the outer edges of the lenses, but not enough to be a problem.