Unsure on how to find the proper buttstock length with your rifle. Larry Vickers gives you a tip in this Vickers Tactical video sponsored by BCM... "In this segment brought to you by Bravo Company USA, Larry gives a few tips on how to properly select the length of pull on your collapsable buttstock."

Ares Airsoft released a video showing that their airsoft version of the L1A1 Self Loading Rifle (SLR) has the same exact length as the real L1A1 SLR, with the video showing that the length is 1143mm. That length is what is indicated in the Wikipedia entry on the L1A1 SLR but according to  Paradata, which is a website in the history of the British Parachute Regiment and Airborne forces, the length is 1180mm.