Hornady Match 75gr BTHP AR-Help

[Walkalong]

By the discrepancy in the reflected light along the shoulder angle, and the break just below it, it was crimped too far

Yep

 

[Demi-human]

I’m polishing the feed ramps because it was rough. I don’t really buy expensive AR parts and this is typical from cheaper AR parts.

So, were the brass shavings jamming it in the chamber?
I’ve seen some pretty chewed up brass from some gnarly ramps, but not in a repeatable malfunction sort of way. Especially not so severe as to jam it so hard the extractor slips the rim.
A cone wedged into another cone by the force of a dead blow, spring powered hammer on the other hand...

At any rate, go easy on the polish, only do the burrs and edges. Leave the hard coat as best you can. Aluminum is soft, the anodizing is the durable part.

 

[Mark_Mark]

So, were the brass shavings jamming it in the chamber?
I’ve seen some pretty chewed up brass from some gnarly ramps, but not in a repeatable malfunction sort of way. Especially not so severe as to jam it so hard the extractor slips the rim.
A cone wedged into another cone by the force of a dead blow, spring powered hammer on the other hand...

At any rate, go easy on the polish, only do the burrs and edges. Leave the hard coat as best you can. Aluminum is soft, the anodizing is the durable part.

thanks bro! I de-burred the edge and polish the living daylights out of it. 1-2 lugs need sone de-burrito-ing and it should be good. A2 Style upper and was $170 shipped. AR’s are ment to be dremaled !

Zzzzzzzzzz always makes them better

 

[Mark_Mark]

So, were the brass shavings jamming it in the chamber?
I’ve seen some pretty chewed up brass from some gnarly ramps, but not in a repeatable malfunction sort of way. Especially not so severe as to jam it so hard the extractor slips the rim.
A cone wedged into another cone by the force of a dead blow, spring powered hammer on the other hand...

At any rate, go easy on the polish, only do the burrs and edges. Leave the hard coat as best you can. Aluminum is soft, the anodizing is the durable part.

Brass shaving everywhere, like it was snowing brass on chamber and lugs

it’s Now, smooth like a baby kick in the face