I found they are very easy to install ... There is a YouTube video that takes you through the process ...
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One thing that is missing from the video is that fact that they include 3 #8 shotgun pellets with the kit ... These are used with the allen screws that secure the Tri-Lug to the front of the upper so that the allen screws don't bugger up the threads ...
As I said, I have these in stock now and am selling them for their MSRP of $169.99 ... (Let's just say $170.00) Does not include firearm or backpack ...
If you would like to see and touch one before purchasing, I have one that I have set up on a 16" AR-15 that I built just for demo purposes ... (I may switch it over to a pistol at some point to make the whole package much smaller)
Here are some pics of the one I have for demo ... In the first pic, it is laying on the small backpack that I use to carry it around ... It's a one arm backpack that I picked up at Walmart ... and it holds several 30 round mags and there is also room for an extra handgun (or 2) plus mags for the additional firearm(s)
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