Here's a pretty interesting video of several guys having what looks like a lot of fun while training.
BCM, CMMG, Colt, LMT, LWRC, Noveske, Springfield
Beretta, Glock, H&K, Para Ordnance, Sig Sauer, S&W
ATS, Blackhawk, Bladetech, Diamondback Tactical, Eagle, Emdom, ESSTAC, HSGI, Magpul, MSA, Norotos, Ops-Core, Peltor, Raven Concealment, Safariland
Shot with a Canon 5DMKII + 70-200 f/2.8 IS L