I just got done testing using a friend’s BCG. I don’t have his upper but this test points to the BCG as the problem.
His carrier is of the AR15 kind, less weight, cut out - you know what it is. Anyways, I tried mine first with one round and good mag and still short stroking. Repeated three times. Slapped in his BCG and voila! The mag hold open test worked every time and I went through two mags of different ammo. I used his BCG minus his bolt and used my bolt in it. Still worked. Used my BCG minus my bolt and used his bolt in it. It short stroked.
This all leads me to the final conclusion that my key somehow loosened up (although it appears it hasn’t moved and is still tight as a tick) OR the M16 carrier isn’t working right. Maybe the slight gas leakage in the above pics plus a heavier carrier means it won’t cycle all the way and switching out springs might fix it??
In any case, Grant I am sending the BCG back to you. Would you like me to go through the hassle of sending you the whole upper as well or not? I ask that you test out my BCG first when you receive it and then do your fix (I assume that’s how you do it but I just want your feedback on the issue when you get it.) Thanks so very much.
Being a cheapskate, I wanted to see if I could fix it myself first before ponying up cash for shipping. I tried backing out the top screw with a screwdriver because I didn’t have the right hex key. It turned loosely in there and I realized the screw must have broken off and there was my leak. So I try to take the back screw out and I strip it thereby fucking everything up. So now I take a dremel and cut the two stake lines deeper so I can put a screwdriver in there. Well, the cut was crooked so the screwdriver kept slipping and the metal seemed to have melded to eachother on the cuts. Cut a little more, nothing, cut perpendicular for a phillips, nothing. So I went near the base of the carrier key and cut horizontal so I could cut the head off the screw. Once I did that it took a little prying and the key popped off. Thankfully, the two remaining pieces of the screws backed right out by hand and now all I have to do is buy a new key and non-faulty screws.
Talk about a pain in the ass. I’ll try to post pictures later.
RESOLUTION: Sent off my BCG to gotm4 who fixed it and upgraded springs/extractors free of charge (I hope I covered enough for the parts) and replaced my carrier key. The MOACKS looks beautiful and I finally got to try it two weeks later. Shot 300 rounds through it today of Wolf and Guat, all worked flawlessly.
I had two Wolf with light primer strikes but both those times I was trying to bump fire and I think I absorbed too much recoil by hanging onto it so loose. Both rounds shot off fine when rechambered and shot correctly.
Thanks gotM4, class act guy!
PS - @50 yards: Wolf shot minute of chest, Guat shot minute of plate from a crouched position. Both groups were a bit left due to messing with the sights.
