#5.7mm

MasterPiece Arms MPA57sst, chambered in 5.7x29mm, is now available with a ATACS camo finish.

Over at the Kifaru forum, “Fairchase” wrote that his FN Five-Seven fired a round out of battery, blowing it up and doing severe damage to his hand and thumb.

A keen-eyed reader noticed that Masterpiece Arms have listed on their website a new MPA pistol chambered in 5.7x28mm. To accommodate the 30 round 5.7mm magazine (the same magazine used by the FN pistols?), they have a redesigned grip, which looks a lot more ergonomic than the aweful MAC-10 grip.

The Savage Model 25 Walking Varminter is available in 5.7x28mm FN.

Wally has written a very interesting guest post at MArooned blog about the 57mm M18A1 recoilless rifle.

[ This article was written by Sven Ortmann of Personal Defence Weapons Central, an excellent small arms resource. ]

by Sven Ortmann, lastdingo@gmx.de, 2008-01-05

There are too many misleading anecdotes and rumors about military rifle calibers floating in the air (and in the WWW). This short article is meant to help readers with a presentation of the results of my secondary source research on the rifle caliber discussion and terminal (wound) ballistics.

Caliber: 9×19 mm and .45ACP (= 11.43x23mm)

This is the standard NATO caliber for pistols and a popular caliber for submachineguns. The only ones who seem to have a strong dislike for this caliber seem to be those U.S. Americans who continue to compare it with .45ACP.

The U.S. American problems with the 9x19mm caliber seem to include a mix of emotions (a Colt M1911 in .45ACP feels much more powerful) and poor quality of the U.S. standard issue 9mm pistols. The latter is as far as I know more a magazine production quality problem than a pistol design problem. The origin of .45ACP is said to lie in combat experience around 1900 in the Philippines where determined Philippinos weren’t stopped reliably by smaller revolver calibers. Tests on live animals in 1904 showed better effects for heavier bullets, but little improvement with velocity. Bullet design has improved a lot since then, and hollowpoint bullets that flatten their nose in soft tissue to increase their diameter are much more effective than simple soft lead bullets. A good 9mm bullet enjoys a similar advantage over a .45ACP soft lead bullet than the latter over a 9mm soft lead bullet. There’s a fundamental problem, though: There’s not much difference in effect on the target if you hit the wrong places and the permanent cavities of pistol bullets are all relatively small. Many body parts are simply not essential enough – their destruction doesn’t stop a determined opponent immediately; no matter whether you hit with .45ACP or 9x19mm.