I have had a few enquiries about how I got the Magpul - PRS Butt Stock to fit onto my Echo1 ASR Riffle, so I figured that I would post my response here so that everyone could read it.
The problem that I had is that the Magpul - PRS Butt Stock that I bought was made for installation on a AEG.
The Echo1 - ASR isn't an AEG and the way that the Buffer Tube mounts on the back of the gun is totaly different than the way that the buffer tube is attached to an AEG. So the bottom line is that I couldn't use the metal Buffer Tube that came with the PRS.
Instead I had to modify the plastic one that comes on the ASR. I had to cut and grind the track thing off of the lower side of the Buffer Tube, and then I had to make the plastic buffer tube a millimeter or two smaller in diameter by sanding the Hell out of it.
Once I did that I was able to get the PRS to slide on and then there is a saddle thing that you bolt on to keep the Butt Stock securely in place.
The whole thing took me maybe 3 hours of fiddling to get just right, but now that it's on, it feels rock solid and it is really comfortable to shoot with. Hope this helps, good luck.
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