5.7 x 28 cartridge was developed by FN on speculation, trying for a new personal defense weapon for military sales. They had some variety of fully automatic carbine and a pistol. No military contracts yet AFIK. The pistol is sold commercially, for a price. The cartridge fires a 23 grain bullet at 2790 fps. That probably is the velocity out of the longer barreled carbine. It was pushed by FN as being an armor piercing round. The cartridge was developed in the 1980s and I have no idea what it would do against present day body armor.
I have picked up some empty 5.7 brass at a fireing range. It appears to be the 25 ACP round modified and lengthened considerably and necked down to 22 caliber.
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Today's Featured Article - Show Coverage: Argyle and Mt. Pleasant Labor Day Weekend Shows - by Cindy Ladage. The last fling before summer fades into fall and we get busy in the fields are the annual Labor Day tractor shows. Beginning on September 5th and running through the 7th, the Argyle Antique Gas and Engine Show is held at the Argyle State Park. Located in West Central Illinois, the pine forest was the setting for the opening of the 22nd show. This year we decided to try to sell a few tractor parts, literature and wrenches to offset my husband's buying sprees. Saturday
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