feed lip problem?

[knkali]

Using Promags. The Bolt locks back after firing the 2nd to last round and the last round is left rattling in the receiver. Is this a feed lip out of spec. Mag is almost new. Should I bend the feed lip inward to help hold that cartrige in place better?
Only happens when doing rapid bursts. Plinking with gun on bench seems OK
thanks

[knkali]

ttt

[jokat989]

ive had trouble with pro mags. they are a soft steel so try monkeying with the feed lip geometry or pick up some pmags

[818gtiguy]

From my experience, Promags are 100% junk. Get youself some quality USGI mags or some Magpul PMags and report back.

[rero360]

From my experience, Promags are 100% junk. Get youself some quality USGI mags or some Magpul PMags and report back.

What he said

[pTa]

AR?

[knkali]

AR?

yes