I kinda view the bottom and top load blocks as vestiges of a by-gone era. Basically it’s for if you have a “dedicated” lower to being 9mm converted. Including a last round bolt hold open mechanism and compatible with most standard AR15 barrel nut and handguard combinations this upper receiver will help take your pistol caliber build to the next level. But yes, you do have to remove the standard bolt catch, fit the block, then reinstall the bolt catch. The EPC-9 upper receiver is the perfect addition to any AR9 build. That said the dedicated block is the better choice, in my opinion, because you don’t need a 9mm bolt catch.
#9mm ar upper last round opening manual
The standard manual of arms with open bolt guns is, “If the bolt is forward the gun is safe and/or empty.” Remember the Colt SMG is an open-bolt gun, so I think Colt didn’t bother with a bolt hold open in the initial design. The “top load” is basically as close to the original Colt SMG pattern as you get outside of Colt parts. The classic model Gen 2 KS47 pistol is kitted out much the same as the classic model rifle. If you don’t care about bolt hold open, then you won’t need the catch. The top-load block basically just fits into the magwell from the top of the receiver and uses a 9mm-specific bolt catch, if you want bolt hold open. Made from 6061-T6 Aluminum, this durable mag well adapter has a built in magazine release for your Glock mags, locks in place with your standard AR-15 magazine catch, releases the same way AR mags do and has a bolt hold open feature that locks your bolt back after the last round. In practice they usually take more fine tuning. You insert the block into the mag well, tighten the tension screws and in theory you’re ready to go. It’s ideal if your lower isn’t dedicated. You also may have to adjust the tension regularly or the block and mag will wiggle. The bottom insert type usually locks the bolt back without any further changes, but may be more mag finicky. No modifications to your 5.56x45 lower receiver Changing calibers is now simply a complete 9mm upper for your AR platform. They use set screws (bottom) and friction (top) to secure the magazine block in place. The top and bottom load blocks are like the Promag or old Spike’s blocks. For use with a 9mm bolt carrier assembly and a standard AR-15 hammer. Hahn makes three different blocks - bottom load, top load, and dedicated. Machined from 7075-T6 billet aluminum with a matte black hard-coat anodized finish. I always thought the suppressed Uzi from Cloak and Dagger was hot hot hot too: I think I need to hit Brownells and see what they've got.Īs a child of the 80's myself, I approve of these images. RevolverRob I've never messed with the Hahn, does the bolt catch have to come out for installation? Not a big deal if it does, I've just never seen it mentioned that I recall. OK, at this point the only advantage a Glock mag lower gets me is a steady supply of cheap-ish mags and but it's duplicated by the Ruger.
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