My newish AR is having issues feeding the first round. Spikes dissipator upper, M4 feed ramps that look properly aligned, not mismatched. Issue appeared today, out of nowwhere. I'm using the same ammo (bulk federal XM193 or whatever) and the same mags that i've used before (pmags) with no issues. I had something like 200 rounds through the gun previously before this happened out of the blue. it hasnt been cleaned since the last time i went shooting, maybe 60 rounds since cleaned. It wont strip the first round from the mag on its own. I drop the bolt and it goes about 1/3rd of the way forward and gets stuck. if i pull the charging handle back, and let it fly again, it'll go into battery. After that, the gun cycles flawlessly. If i take the mag out, with say only 20 rounds in it, unload it, reinsert the bag and either pull the charging handle or drop the bolt it'll do the same thing. doesnt matter how many rounds are in the mag. It looks like the bullet is getting stuck in the notches at the top of the feed ramp where the bolt locks in (sorry, i dont know the terms in mnew to AR's). The feed ramps or notches in the barrel extention pinch and gouge the bullet, its leaving deep gouges in the jacket. ideas? like i said, it cycles fine once its loaded, but it just out of nowhere started to refuse to strip the first round. you can faintly see the gouge on the bullet.