I installed the Element UBR on my WE416 and the buffer tube fit like a dream. Only thing I had to do was cut down the nylon spacer to allow enough bolt travel (to a total of 22mm iirc, but it was several years ago). Its been a great stock, and I'm exceedingly happy with it.
Edit, I also sourced some very small washers to go around the little screws that hold the top cover on, as they were slightly too long and I didn't want to try cutting them down).
I have seen reports on gasguns.info that the PTS tubes do fit, but only after some serious filing, possibly the height of the threads? I'd do a search on there to verify that before you do anything though.
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Canadian living in NZ.
Last edited by Aurelien; March 19th, 2012 at 01:33..
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