I've researched pistol caliber ARs, HK, Uzi, Highpoints..etc The most promising weapon (IMO) is the fairly new JR Carbine. I'd like the advice and perhaps experience of fellow members before purchasing: Link: http://www.justrightcarbines.com/JR_Carbine_Products.html Here's what I've found to be accurate: 1. Nearly compatible with all AR parts (barrel/bolt/handguard not?) 2. Takes Glock mags (now also 1911 model) 3. Easily converts to/from 9mm, 40 S&W, and 45 ACP 4. A threaded barrel version is also being made. 5. Early serial #s had reliability issues....seem to be corrected. 6. Reported to be accurate Anyone have any caveats or recommendations for other versatile platforms for subsonic suppression and semi-auto fire? Any ideas for a locking bolt mechanism for ultimate sound reduction (does this normally void warranty)? JR carbines seems to listen to the consumer and has been quite responsive in fixing and adding features. Any other desirable features for a suppressed carbine that should be considered? Thank you!