This also carries around for the fuel block, which the rimfire version doesn't require, being a straight blowback.
The internals are on par for just a rimfire. I did not go to the trouble to disassemble but at a https://kkgelblaster.com/products/electric-m416-hk416d-assault-rifle-gel-ball-blaster
The Definitive Guide to hk416 disassembly
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