Well made anodized aluminum spacer. - HERA Arms 121202 CQR Buttstock Spacer Aluminum 1.5"

You either need this or you don’t. CQR Gen 1 comes standard with a 15mm spacer installed. I’m 6’2” with long arms so I needed the extra 15mm in length on my CQR Gen 1 stock. Truthfully, I probably actually need the 45mm spacer, but they were out of stock.

Note: You can stack the three spacer sizes together toget the length you need, but will have to buy appropriate size and length metric hex head bolts separately.

As with everything Hera makes, high quality.