58M MOD is our mid-length S.I.R.® w/the front relieved to fit around the carbine length front sight post and/or to allow for a fold down front sight. Wt. 18.4 oz*
*Wt. measured without 1,2,3 rails and sling swivel which are included with the SIR system. Rails can be removed/added as needed.
*Front handguard cap must be removed prior to installation.
