Strike Industries JCOMP Gen2, Compensator, 223 Rem/556NATO, Black, 1/2X28 SI-JCOMP2-223/5.56 The SI JCOMP Gen2 is the classic Type 89 compensator re-engineered and updated for the 21st century. Due to end user feedback" the favorite features of the original are retained" but the J Comp now features increased muzzle rise compensation" and is available in 5.56x45/.223. Now also compatible with Oppressor and FerFrans concussion reduction devices.