Upper Handguard mounted above the gas-block of any standard-length AK-series rifle (excluding PP-19-01 Vityaz and AKS-74U). Different from B-31 by having an indent at the end that allows it to be mounted on short-barrelled fullsize AK's such as the AK-105 where the front sightpost sits above the gas-block. Can be used on short and along barrel rifles. B-30 required to mount. Lower handguard not included.
B-31S Upper Handguard for Long and Short Barrel