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Can you be a little more specific about your testing? The numbers I have seen are that the uppers last 40,000 rds with M855 and 20,000 rounds with M855A1. How much of each are you shooting to reach your conclusion? How do you measure "wear"? What about Lancer, I thought the feed angle was better than USGI?
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In my testing only ETS and Pmags remove weapon wear when M855A1 is used.
Can you be a little more specific about your testing? The numbers I have seen are that the uppers last 40,000 rds with M855 and 20,000 rounds with M855A1. How much of each are you shooting to reach your conclusion? How do you measure "wear"? What about Lancer, I thought the feed angle was better than USGI?
I only had a magazine.
Final testing was basically firing 5 rounds through 6 seperate magazines to see where on the feed ramps they struck.
When fired on auto(ended up using my ranges rental lower, 4 out of 6 had the steel penetrator striking the aluminum M4 cuts.
Only Pmags and ETS mags kept the steel penetrator confined to the steel feed ramps in the barrel extension.
I need to update my post one of these days. Also Magpul guys got my stickers, thank so much!
Now granted, 5 rounds of M855A1 fired in full auto isn't definitive, but its the best I've seen on a public forum on the issues, and its obviously enough of an issue for the Army to make modifications to the aluminum GI mags.
Lancer L5AWM from what I could tell have identical feed rangles to GI mags when not supported(you can also bipod them and change the feed angle, but I didn't).