AR 5.7 Upper [Archive] - Glock Talk


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06-13-2010, 12:12
Would the 5.7 uppers readily available online be a reliable alternative caliber and config for urban defense or just a gimmick with no real legs?

06-13-2010, 13:17
First the 5.7 was made to be a PDW and pistol round to replace the 9mm and able to defeat body armor when the real 5.7 ammo is used(not available to public). The guys making ARs thought a rifle/pistol combination using the same ammo would be a good idea. The ammo is not as effective as 5.56 and more expensive.
It is lighter weight and the mags have a much higher capacity.

So if going that route to replace a 9mm sub gun yes, to replace the 5.56? no IMO.

06-13-2010, 15:21
Thanks for the info, Harrison!! I didn't realize there was a difference in the public-available ammo. Saves me a bit of $$.