The Mark 5 buttstock reduces felt recoil and muzzle climb to make follow-up shots faster and more accurate. Single-handed firing is also much easier. The stock is made of tough fiberglass filled plastic and comes with a soft 1" rubber recoil pad and a quick detach swivel stud. These stocks have the innovative spacer system and come with two 1/2" spacers included which adjusts the length of pull from 13" to 14". Extra spacers can be purchased in 1/4, 1/2 and 3/4 inch lengths.