These replacement buttstock modules allow the standard MBS 22 to be converted to the Mod 1 or vice versa. Be aware that the MBS 22 standard stock will require an 18" barrel or longer to avoid SBR laws and that not all states measure the overall length of rifles with collapsing stocks in the extended position. Additionally, some states have regulations on "feature" counts and the Mod 1 stock may add a collapsing stock as a feature in those cases. Know your state and local laws before purchasing; you are responsible for compliance.
