Signs of overpressure when reloading for AR?
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Widow maker 223
Active member
The one I look for is ejector swipes, It will be the first to show up.
Varminterror
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Originally Posted By: Widow maker 223The one I look for is ejector swipes, It will be the first to show up.
Not arguing this, but I'll comment that it's not quite so straight forward for all AR's. Case Head Swipes (CHS) are a symptom of an overgassed AR. I generally consider ejector impressions, and extractor cut impressions, to be overpressure signs, but swipes can occur when the action is overgassed and the bolt is trying to open too early. With an adjustable gas block, if you start closed and work your way open, you'll never see that symptom.
Not arguing this, but I'll comment that it's not quite so straight forward for all AR's. Case Head Swipes (CHS) are a symptom of an overgassed AR. I generally consider ejector impressions, and extractor cut impressions, to be overpressure signs, but swipes can occur when the action is overgassed and the bolt is trying to open too early. With an adjustable gas block, if you start closed and work your way open, you'll never see that symptom.
Widow maker 223
Active member
Thanks Varmin for correcting me. I meant to type ejector marks dont know why I was thinking swipes. And yes the swipes are from a over gassed gun more so showing up in carbine length gas systems.
Varminterror
New member
Originally Posted By: Widow maker 223Thanks Varmin for correcting me. I meant to type ejector marks dont know why I was thinking swipes. And yes the swipes are from a over gassed gun more so showing up in carbine length gas systems.
Slip of the tongue (or fingers, I suppose), amigo, no harm, no foul. For most standard gas block rifles, over pressure impressions are followed hand in hand by swipes, since over pressure rounds will yield an over gassed action too, the ol' double whammy. I just wanted to differentiate the difference between the two, since "new to reloading for the AR" kinda also means "new to reloading to suit my AR's gas system."
But I gotta say too, it sure seems like most models on store shelves are leaving factory with an over-flow gas system - I guess the logic is that we'd rather be hard on brass and batter the action than have a bunch of guns come back failing to eject.
Slip of the tongue (or fingers, I suppose), amigo, no harm, no foul. For most standard gas block rifles, over pressure impressions are followed hand in hand by swipes, since over pressure rounds will yield an over gassed action too, the ol' double whammy. I just wanted to differentiate the difference between the two, since "new to reloading for the AR" kinda also means "new to reloading to suit my AR's gas system."
But I gotta say too, it sure seems like most models on store shelves are leaving factory with an over-flow gas system - I guess the logic is that we'd rather be hard on brass and batter the action than have a bunch of guns come back failing to eject.