RS Regulate121688357
Rs Reg Rear-Biased Modular Lower - Precision Engineered for Optimal Performance$151.33
Availability: In Stock
The RS Regulate Yugo Lower-Biased Modular Lower Receiver is the foundation of a rock-solid optic mounting system for Yugo and Serbian pattern AK rifles. If you've got a Zastava M21, PAP, NPAP, or OPAP and want to mount modern tactical optics with precision and confidence, this lower mount pairs with RS Regulate's modular upper mounts to bring AR-15-style optics onto your AK platform. Unlike traditional AK side-rail mounts that can be finicky, the RS AK-300 system is engineered to hold zero and let you dial in proper eye relief and head position—without modifying your rifle or interfering with its operation.
Built from 6061 T6 aluminum and finished in durable matte black hardcoat anodize, this lower receiver is lightweight but built to last. The titanium locking mechanism is low-profile and stays out of your way—it won't protrude from the mount or into your trigger guard. Installation hardware is included; all you need to add is the optic-specific upper mount that matches your particular optic (sold separately). The modular design means you can adjust both the vertical over-bore height and front-to-back position of your optic to dial in the perfect setup for your shooting style and rifle geometry.
This is the front-biased version, designed specifically for Yugo rifles with a front-biased lower rail. If your rifle has a full-length lower rail, you'll want the AK-307M instead. The RS Regulate system is purpose-built to work with your rifle as-is—no permanent modifications, no reliability compromises, just repeatable mounting that holds your optic exactly where you put it.
| Manufacturer | RS Regulate |
| Product Type | AK Modular Optic Mount Lower |
| Rifle Compatibility | Yugo/Serbian pattern (M21, PAP, NPAP, OPAP) |
| Configuration | Front-biased lower rail |
| Material | 6061 T6 aluminum |
| Finish | Matte black hardcoat anodized |
| Locking Mechanism | Titanium |
| Hardware | Installation hardware included |
This front-biased lower mount is designed for Yugo and Serbian pattern rifles including the Zastava M21, PAP, NPAP, and OPAP. It specifically fits rifles with a front-biased lower side rail. If your rifle has a full-length lower rail, the AK-307M is the correct choice.
Yes. The RS Regulate AK-300 system is modular—the lower receiver attaches to your rifle's side rail, and you pair it with an optic-specific upper mount that matches your particular optic. The upper mount is sold separately.
No. The RS Regulate mounting system is designed to work with your rifle without any permanent modifications. It also won't interfere with the reliable operation of your rifle or block access to the charging handle and trigger guard.
The lower receiver comes with all necessary installation hardware. You'll need to purchase the matching optic-specific upper mount separately.
SKU: 114461073 • Width: 3.5in • Height: 1.25in • Depth: 8in • Weight: 0.31oz
Availability: In Stock
The RS Regulate Yugo Lower-Biased Modular Lower Receiver is the foundation of a rock-solid optic mounting system for Yugo and Serbian pattern AK rifles. If you've got a Zastava M21, PAP, NPAP, or OPAP and want to mount modern tactical optics with precision and confidence, this lower mount pairs with RS Regulate's modular upper mounts to bring AR-15-style optics onto your AK platform. Unlike traditional AK side-rail mounts that can be finicky, the RS AK-300 system is engineered to hold zero and let you dial in proper eye relief and head position—without modifying your rifle or interfering with its operation.
Built from 6061 T6 aluminum and finished in durable matte black hardcoat anodize, this lower receiver is lightweight but built to last. The titanium locking mechanism is low-profile and stays out of your way—it won't protrude from the mount or into your trigger guard. Installation hardware is included; all you need to add is the optic-specific upper mount that matches your particular optic (sold separately). The modular design means you can adjust both the vertical over-bore height and front-to-back position of your optic to dial in the perfect setup for your shooting style and rifle geometry.
This is the front-biased version, designed specifically for Yugo rifles with a front-biased lower rail. If your rifle has a full-length lower rail, you'll want the AK-307M instead. The RS Regulate system is purpose-built to work with your rifle as-is—no permanent modifications, no reliability compromises, just repeatable mounting that holds your optic exactly where you put it.
| Manufacturer | RS Regulate |
| Product Type | AK Modular Optic Mount Lower |
| Rifle Compatibility | Yugo/Serbian pattern (M21, PAP, NPAP, OPAP) |
| Configuration | Front-biased lower rail |
| Material | 6061 T6 aluminum |
| Finish | Matte black hardcoat anodized |
| Locking Mechanism | Titanium |
| Hardware | Installation hardware included |
This front-biased lower mount is designed for Yugo and Serbian pattern rifles including the Zastava M21, PAP, NPAP, and OPAP. It specifically fits rifles with a front-biased lower side rail. If your rifle has a full-length lower rail, the AK-307M is the correct choice.
Yes. The RS Regulate AK-300 system is modular—the lower receiver attaches to your rifle's side rail, and you pair it with an optic-specific upper mount that matches your particular optic. The upper mount is sold separately.
No. The RS Regulate mounting system is designed to work with your rifle without any permanent modifications. It also won't interfere with the reliable operation of your rifle or block access to the charging handle and trigger guard.
The lower receiver comes with all necessary installation hardware. You'll need to purchase the matching optic-specific upper mount separately.
SKU: 114461073 • Width: 3.5in • Height: 1.25in • Depth: 8in • Weight: 0.31oz