AR-15/M16 9MM DROP-IN CONVERSION BLOCKS W/32RD MAGAZINE Reviews & Ratings

Allows for a quick conversion to 9mm in conjunction with a 9mm upper
Compatible with colt type 9mm upper receivers
Use existing AR-15/M16 lower receiver
If used with 100-004-363 9mm bolt carrier, there is no need to swap out the standard hammer, allowing for a quick and easy change of calibers

Conversion Blocks - One-piece, machined aluminum block converts AR-15 lower receiver to 9mm. Compatible with all, Colt-type, 9mm upper receivers, the feed ramp is cut for reliable feeding with all types of ammo, including hollow point and frangible ball. Roller retention device holds block securely in receiver, prevents accidental release. Hardened steel ejector, feed ramp and bolt hold open give long service life; last-round-hold-open feature on bottom-loading model works when used with Colt magazines. Also works with modified UZI magazines but last-round-hold-open will not function. No receiver modification required. Top-Loading Block installs from the top of the lower receiver and Bottom-Loading Block installs from the bottom of the lower receiver.

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Fantastic Kit!

So there is no confusion what you are getting, here are the part numbers. It coems with the nice MetalForm magazine (part # 620-000-021) and the mag block is part # 100-000-920. I used these in a Post 86 full-auto and they are going great! Not a single hickup. The only other part you will need for your lower is a 9mm bolt catch (part# 160-308-101). This will allow you to retain the bolt hold open feature. For the money, this is a fantactic kit. If it runs flawlessly in my full-auto, it will be just fine in semi-auto only configurations. The reason this gets 4 stars, rather than 5, is the bolt catch should just be included in the kit.