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Colt river socom4 from United States, MI Public Profile
Nothing fancy just an ordinary H2 buffer that's well made and affordable. I put this in my latest build that had a slightly overgassed mid length system and this buffer got the ejection pattern to 4 o'clock right where it should be, so far 450 rounds 0 issues thx OP.
Bought the FDE,version for a 19x, that was milled for a trijicon rmr, not the MOS, the included plate fit perfectly, however the shortest screws were still too long and required some modifications, the screws were easily sanded down using a work sharp knife sharpener which only took a few seconds to get them to the correct size, after which I applied fresh blue loctite and they are solid. The 509t still fits in a safariland holster without issues, and literally took 3 clicks down to be zeroed perfectly. So far after a range day of 550 rounds, there are no issues everything is working like it should, and I'm happy.
The holosun 507c in wolf gray is awesome, green reticles are crisp and precise easy to change reticles and has all the features like shake awake, lockout mode etc. Also uses the classic rmr footprint so it really is a great choice my safariland holster needed a little modification to accommodate a red dot but that is not a holosun issue, it's a safariland issue. I would definitely recommend this to anyone thinking about getting one.
The size and texture of the WC is far better than standard, the color is exactly the same and simple installation great product. Ps yes 21 round mags work fine.