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Looking at getting an SL8, but I have a question about updating it to handle high cap mags. Is it possible to only install a G36 magwell, and if so, what is needed to do it. Don't really what to convert it to a G36, just want to update it to take the high cap mags.


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Yes and no. You'd require a new bolt as well. Not to mention some cutting of the receiver, reinforcing, and affixing a plate over the gap it leaves.

I'll let someone else rain on your parade with 922r.
 

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Promag makes single stack hi cap mags that work with no modification. If you're looking to use double stack AR or G36 mags, that that requires a new bolt and cutting the depression out of the side of the receiver. You don't have to fill the resulting hole in the side of the receiver if you don't want to as it works fine, but a number of people do as it looks better with it filled Also, if you're going to go this route, you'll need a number of 922r compliance parts and that can get pricey.
 

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As soon as you modify the semi-automatic rifle to accept double stack magazines (technically, readily available high capacity), you must comply with 922(r) which restricts you to no more than 10 (out of the list of 20 key components) imported parts. Just expanding the magwell, you have Buttstock (which includes the trigger housing and rear trunion block all as one part), receiver, barrel, piston, operating rod, bolt carrier, bolt, trigger, hammer, sear, handguard, and then the magazine body, baseplate, and follower. A total of 13 parts.

With U.S. made AR mags, and a U.S. made bolt (which you'd need to change in order to feed from double stacked magazines) you would be at 10 imported parts, and compliant with 922(r). Usually what catches people up, is when they replace the SL8 buttstock with more import parts because G36 rear block, butt stock, and trigger housing are each seperate parts.
 
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