I hot glued a Vortex Venom with top load battery to my SIRT to simulate my Glock MOS/RMR06's. It was still great for dry fire practice but as others have mentioned it got boring seeing a red dot hit a red dot over and over... I let the RDS get knocked off as I didn't do a good prep job anyways and just use it as normal.
I keep a one of my MOS/RMR pistols handy around the house and just practice presentations all day long...
Dennis.
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I used to desire this quite a bit, until I realized from several threads here that the laser may not be doing me the favors in training I thought it was. I finally sold my SIRT, bought the DryfireMag, and had a buddy 3D print a bright yellow Glock training barrel. I haven't looked back, it's perfect. I'm using the sights or RDS on the actual gun, get the repeated trigger pull, and I'm not distracted by lasers.