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RS Regulate
The RS Regulate Rear-Biased Yugo Modular Lower Handguard Adapter is a purpose-built mounting solution for Serbian and Yugo-pattern AK rifles looking to run modern optics on a side rail. If you're running an OPAP, NPAP, M21, or similar Yugo-type platform, this rear-biased lower adapter slots into RS Regulate's modular AK-300 system—the industry standard for non-destructive AK top-rail mounting. Unlike fixed mounts, the modular design lets you swap uppers and lowers to dial in your sight picture and cheek weld, whether you're building a precision rifle or a run-and-gun field gun.
RS Regulate's Yugo-specific lower has spent years on the market proving itself with AK builders and shooters who demand reliability without gunsmithing. The rear-bias geometry works for shooters who prefer optic placement further back on the receiver—giving you a longer sight radius and cleaner ergonomics with charging handles and side-folding stocks. Once you lock in your upper and confirm zero, the connection is rock-solid and repeatable.
This is the lower only; you'll need an RS Regulate AK-300 upper matched to your optic (Aimpoint, Trijicon, Eotech, etc.) to complete your setup. Compact, lightweight, and built to the exacting tolerances Yugo shooters have come to expect from RS.
| Brand | RS Regulate |
| Product Type | Modular Lower Handguard Adapter |
| Compatibility | Yugo/Serbian AK rifles (OPAP, NPAP, M21 pattern) |
| Configuration | Rear-Biased |
| Dimensions | 5.71 × 0.55 × 1.88 inches |
| Weight | 3.37 oz |
Yes, the rear-biased Yugo lower is designed for OPAP, NPAP, and M21 pattern rifles with Yugo/Serbian side rails. If you have a different AK platform (Romanian, PSL, Czech vz. 58, or front-biased preference), RS Regulate makes a lower for that too—check compatibility carefully before ordering.
This is the lower adapter only. To mount an optic, you'll also need an RS Regulate AK-300 upper that matches your specific optic type (Aimpoint, Trijicon, Eotech, etc.). The upper and lower connect to form the complete modular system.
No. The RS Regulate system is non-destructive and reversible—it mounts to your rifle's side rail without alteration, so you can remove it anytime without damage to the rifle.
Rear-bias positioning moves your optic further back on the receiver, giving you a longer sight radius, more clearance with charging handles, and better ergonomics with side-folding stocks. Front-bias brings the optic closer to the muzzle for a shorter sight radius. Choose based on your shooting style and setup.
RS Regulate
The RS Regulate Rear-Biased Yugo Modular Lower Handguard Adapter is a purpose-built mounting solution for Serbian and Yugo-pattern AK rifles looking to run modern optics on a side rail. If you're running an OPAP, NPAP, M21, or similar Yugo-type platform, this rear-biased lower adapter slots into RS Regulate's modular AK-300 system—the industry standard for non-destructive AK top-rail mounting. Unlike fixed mounts, the modular design lets you swap uppers and lowers to dial in your sight picture and cheek weld, whether you're building a precision rifle or a run-and-gun field gun.
RS Regulate's Yugo-specific lower has spent years on the market proving itself with AK builders and shooters who demand reliability without gunsmithing. The rear-bias geometry works for shooters who prefer optic placement further back on the receiver—giving you a longer sight radius and cleaner ergonomics with charging handles and side-folding stocks. Once you lock in your upper and confirm zero, the connection is rock-solid and repeatable.
This is the lower only; you'll need an RS Regulate AK-300 upper matched to your optic (Aimpoint, Trijicon, Eotech, etc.) to complete your setup. Compact, lightweight, and built to the exacting tolerances Yugo shooters have come to expect from RS.
| Brand | RS Regulate |
| Product Type | Modular Lower Handguard Adapter |
| Compatibility | Yugo/Serbian AK rifles (OPAP, NPAP, M21 pattern) |
| Configuration | Rear-Biased |
| Dimensions | 5.71 × 0.55 × 1.88 inches |
| Weight | 3.37 oz |
Yes, the rear-biased Yugo lower is designed for OPAP, NPAP, and M21 pattern rifles with Yugo/Serbian side rails. If you have a different AK platform (Romanian, PSL, Czech vz. 58, or front-biased preference), RS Regulate makes a lower for that too—check compatibility carefully before ordering.
This is the lower adapter only. To mount an optic, you'll also need an RS Regulate AK-300 upper that matches your specific optic type (Aimpoint, Trijicon, Eotech, etc.). The upper and lower connect to form the complete modular system.
No. The RS Regulate system is non-destructive and reversible—it mounts to your rifle's side rail without alteration, so you can remove it anytime without damage to the rifle.
Rear-bias positioning moves your optic further back on the receiver, giving you a longer sight radius, more clearance with charging handles, and better ergonomics with side-folding stocks. Front-bias brings the optic closer to the muzzle for a shorter sight radius. Choose based on your shooting style and setup.
