The AR-15 .22 Conversion unit is the newest innovation from Tactical Solutions. It will work on most standard AR-15 lower and is sold as a self-contained complete unit (upper receiver and barrel). If your lower has a notched hammer, this may cause functionality issues and we recommend replacing it with a non-notched hammer which can be found here. (Please see picture below)
There are three model options available:
AR-15 M4: This option is similar to the standard military AR-15. It features an A1 Flash hider.
AR-15 LT: This lightweight option features a threaded aluminum barrel and Hogue forend.
AR-15 MC: This integrally suppressed conversion unit features a monocore unit with removable titanium baffles for easy cleaning.

This is a picture of a notched hammer. If you have a notched hammer, we have a very simple remedy that will not affect the functionality of your firearm. All you need is a replacement hammer that is not notched.
WARNING: We do not recommend the use of Remmington® Golden Bulk Ammunition. It is also recommended to not use CMMG Magazines with our product.