Almost bought another ... almost. - Recover Tactical Glock Stabilizer Kits - Conversion Carbine

When a firearm is installed the cycling has issues and jams every couple rounds, tried 10 different magazines, tried another slide w/o their charge handle installed (their charge handle is wide and rubs one side of the brace's frame, which isn't good eother), and the 2nd slide had same issues and was not rubbing. Tried another gun-- same issue. Tried the same guns without the brace-- no problems. To correct the jams l learned all I had to do was smack the bottom of the gun to jolt the action to continue. Device makes for unreliable feeding which is NOT GOOD. Reached out to manufacturer, sent tons of details and pics. Their response-- "Our kits are designed with very tight tolerances for a secure fit, which means they sometimes require a brief break-in period to settle properly. In some cases, a small modification might be needed to ensure it is fully compatible with your setup." Ok, I expect 300 rounds to be much more than a brief break in period, and I don't recall the manual stating that modifications might be needed-- usually they don't like you tweaking their products to maintain warranty. I decided not to order any more from them as they should have offered to replace or correct the issue. If I wanted to work on it myself I'd just have 3D printed one. Unfortunately not sure why, this was a final sale so I'm stuck with it. Just a range toy -- novelty junk now.