Blocked Magazines

[Straightbolt]

Finishing a 7.62x39 AR build and need some mags. Anyone try these ASC 20 round mags blocked to 10 rounds ? How do they "block" them ? http://www.ammosc.com/10-rd-blocked-20-rd-7-62-x-39-stainless-steel-magazine/

 

[BradMacc82]

Hard to say based off a (possibly?) generic magazine photo on their website.

But a little google-fu has hit on a likely way they do it, a different magazine follower with an extended leg that bottoms out the magazine at 10 rounds, instead of 20.




Looks like a trip over the MD state line with a pair of tin snips remedies that issue.