These are like the Ruger SBX, but a 22lr AR upper.
http://www.tacticalsol.com/tshome/ar22-22lr-conversion
The AR-22 SBX barrel is a 6061-T6 lightweight aluminum threaded end* barrel with a 4140 button rifled steel liner and Hogue® free float forend. The SBX barrel has bore length of 12.25” with a permanently attached shroud for an overall length of 16.5” allowing the user to attach a suppressor without adding length. This gives the user all the advantages of a short barreled rifle without the time consuming and costly SBR paperwork. As with all of our AR-22 conversions, it includes our CNC machined bolt assembly with 416 stainless steel bolt and precision ground tool steel guide rails for strength and smooth, reliable, functionality. In addition, the AR-22 SBX includes a forged charging handle with our tactical latch. Each conversion is shipped with a 10 or 25** round Black Dog Machine magazine.
It allows you to have a suppressor on that doesn't stick way out without the SBR stamp. Like this model below
The barrel is .92 diameter and this is a 50yrd group
The Barrel nut is permanently attached so any rail system would need to be one that attaches to a standard barrel nut.
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