This USA Made adapter allows for easy conversion from any standard .223/5.56 lower receiver to 9mm. The easy drop in design installs in minutes, with no gun smithing or permanent modifications needed to the lower receiver. Key features are:

Last round bolt hold open
Steel feed ramps
Installs from the bottom of the magwell with top and bottom locking screws
No dissassembly of the bolt catch required
Installation:
Remove screw and washer that is pre-installed next to the ejector
Feed the magwell like a regular magazine into the mag well
After locking into the lower, re-install the washer and screw
Then use the provided screws (2) and hex key to set the block into place from the bottom

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