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Used this stock as an upgrade for my AR9 carbine. Stock is way more comfortable than the normal $12 mil spec. Trying to keep this build lightweight and easy to maneuver. Also like the QD mount.
I have two of these adapters and have had zero issues with them. One is installed in a 10.5" pistol with PSA lower, PSA gen2 BCG, and PSA Barrel. The other adapter is installed in a 16" carbine with PSA lower, Faxon BCG, and Faxon barrel. Using 4, 20rd C products and 5. 32rd C products mags, These mags fit and function perfectly. DO NOT USE ProMag magazines. They are junk. do not fit in the adapter way too tight and feed lips scrape the bottom of the BCG.
Have on of these mounted on a low cost 300 blkout AR carbine and another on a 300 blkout Ruger American ranch. These carbines are intended for use at 50-150yds and this scope seem to do the job. They are mounted both with cantilever and standard scope rings and hold zero very well. Shouting 1moa groups off a benchrest at 50 yards. wish the reticule lines were a bit thinner and the illumination feature is not really all that useful. Also the X1 magnification is not true. Glass is pretty clear for a scope in this price range. Ocular is just a bit on the stiff side but not that bad. All in all, it's OK for the price point at $140. definitely wouldn't pay above that.
Trying to load over 20 rounds in these mags is a real pain in the thumbs and nobody makes a loader for them. Tough to get through a full mag without having a FTF using 115gr FMJ. Using an AR stoner 10.5 upper. Have another AR9 build with an AR Stoner upper but with guntec mag adapter and Colt mags and haven't had any kind of jam yet, very reliable. Noticed the feed ramp of the guntec is much higher than the feed ramp on the endomag. Endomag might work better with uppers that have more of a bevel at the edge of the chamber. Definitely don't like the fact that you need to have an endomag inserted to eject a round. Rather lose some versatility than have a safety issue.
I'm using a standard AR buffer tube (inside length measured from back of buffer tube to retaining pin 7 1/16"), standard AR buffer and carbine spring and spacer will not allow the bolt to retract enough to engage bolt catch. Tried this spacer in two other ARs and same thing.
Thought I could use the spacer instead of a stack of quarters in my AR9 build but just too thick. Be nice if Spikes could make a lightweight aluminum adjustable spacer.