RS Regulate Yugo Full Length Lower Features The RS Regulate Yugo Full Length Lower is engineered as part of the AK-300 Modular Side Mount System a design that pairs a rifle-specific lower mount with an optic-specific upper mount to deliver a secure precise optic mounting solution on AK platform rifles. This particular lower is built for the full-length side rail found on Yugo and Serbian pattern rifles including the Zastava M21 PAP NPAP and OPAP distinguishing it from the front-biased AK-306M variant. Once paired with the correct upper mount sold separately the system lets users adjust both the over-bore height and front-to-back position of the optic for proper eye relief and head position. This modular approach allows a single lower mount to work with a wide range of optics simply by swapping the upper component. Machined from lightweight yet strong 6061-T6 aluminum the mount is finished in a durable matte black hardcoat anodized coating that resists wear from field use and repeated mounting and dismounting. A low-profile titanium locking mechanism secures the mount firmly to the rifle s side rail without protruding into the trigger guard or interfering with normal operation. Importantly this mounting system is designed not to require replacement of any factory rifle components and will not interfere with the reliable function of the rifle. Installation hardware is included making this a practical non-permanent way to add precision optic mounting to a Yugo or Serbian pattern AK rifle. RS Regulate Yugo Full Length Lower Specifications Manufacturer: RS Regulate Model: Yugo Full Length Lower Compatible Hosts: Zastava M21 PAP NPAP OPAP Yugo/Serbian Pattern AK Rifles Color: Black Finish: Matte Mount Type: Quick Detach Number of Bases: 1 Ring Type: Low Available At: GrabAGun