Quote:
Originally Posted by gettysburgfreak
failed to feed, as if the bolt isnt going all the way back to allow the round to chamber. The round would be stuck between the mag and the chamber.
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If the bolt is picking up the next round then it is going back far enough.
Do you have another buffer spring you could try out?
What rounds are you shooting? New in box or reloads? If you're running reloaded military brass then it was most likely ran though a M203 or another MG with a loose chamber. When you full length size the brass it doesn't actually size at the base. The base is fire formed for a much looser chamber, hence it won't chamber in your rifle.