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M1A vs AR-10 vs SR-25 vs PTR-91

At present, this article is a dumping ground for miscellaneous facts, which I hope to whip into a real article down the road.

• Like the AR-15, the AR-10 is a direct gas impingement system.
• The PTR-91 is, like most HK weapons, a recoil-operated delayed roller locking system system. Like the HK91, the PTR-91 uses a fluted chamber to improve extraction reliability. This is at the cost of doing much greater damage to brass than any of the other 308 rifles mentioned here.

Magazines

M1A's accept M14 magazines or M1A magazines.

AR-10s have their own type of magazine.

Ease of Maintenance

The PTR-91 is, like most HK-pattern weapons up untl the late 90s, welded together. While getting the bolt out is fairly easy, stripping it down completely is far more involved than in the AR platform.

-- SeanNewton - 02 Jan 2009