I have the Lage upper for my Mac 10 and am wanting to suppress it. I'm torn between the Gemtech Viper (which has the locking feature that is uber cool) and the AWC Mk-9 in 45. What I'd really like to know is if there is any "blow back" through the ejection port using the Viper. It is significantly thinner in diameter than the Mk-9, and that causes me concern as I'm a lefty.
Does anyone here have a Viper? If so, please chime in with your impression and experience.