For players who live in California, or other states where fields are placing restrictions on HPA, or who are looking for a true DMR lockout solution, this little piece by DH Customs is for you! By locking out the FCU completely from adjustment, restrictions like 30rps, three round burst, and semi only can be truly enforced.
Entire lock fits inside a standard size buffer tube. Dimensions are 2 9/16″ X 13/16″ X 1/2″.
FCU not included