Innovative Industries A2 Butt Stock Spacer and Screw
Used to extend buffer tube for fixed stoxks
https://m.media-amazon.com/images/I/71cIY7Fa1-L._AC_SL1500_.jpg
https://m.media-amazon.com/images/I/31dekpqpZGL._AC_.jpg
https://m.media-amazon.com/images/I/31dekpqpZGL._AC_US40_.jpg
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Polotrag
{"Brand Name": "Polotrag", "Color": "Colour+1", "Part Number": "Ii-057", "Size": "colour+1", "Date First Available": "August 25, 2015"}