SAG MK4 Chassis for Compact AKSU Platforms – Free-Float 1913 Monorail
- $1 469.00
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SAG MK4 Chassis for Compact AKSU Platforms – Free-Float 1913 Monorail
CNC-Machined Aluminum | Free-Floating Barrel | Tubular Handguard | 1913 Top Monorail | No Gunsmithing | Reusable
The SAG MK4 Chassis (S20193) by Sureshot Armament Group is a complete solution for adding optics and lighting to compact AKSU-type sporting platforms without any modification to the original carbine. Installation requires removing the factory receiver cover, gas tube, and handguard.
Once installed, the chassis fully free-floats the barrel inside a tubular handguard and provides a continuous 1913-MIL-STD top monorail running over the barrel and receiver, from the gas block to the end of the shortened receiver cover. The front section of the rail does not require removal for field-stripping, the stock still folds completely for transport, and the iron sights are not blocked.
The removable rear receiver-cover section carries its own 1913-MIL-STD segment for optics that do not need to retain zero – such as a magnifier for a red dot, or a night-vision attachment. If the carbine reaches the end of its service life, the chassis can be reinstalled on a new carbine.
? Installation Note
Installation requires removing the factory receiver cover, gas tube, and handguard. The chassis must be installed in accordance with the included manual.
? Key Advantages
- Free-floats the barrel – inside a tubular handguard for improved consistency
- Continuous 1913 top monorail – gas block to shortened cover, for optics and lighting
- No gunsmithing required – no modification to the original carbine
- Front rail stays on for cleaning – no removal for field-stripping
- Folding-stock compatible – stock folds fully for transport
- Removable rear cover rail – for magnifier or NV attachment (no zero retention needed)
- Does not block iron sights
- Reusable – can be reinstalled on a new carbine
Technical Specifications
| Material | High-Strength Aluminum Alloy (CNC-milled) |
| Product Code | SAG-S20193 |
| Top Rail | 1913-MIL-STD monorail (gas block to shortened cover) |
| Rear Cover Rail | 1913-MIL-STD segment (removable section) |
| Barrel | Free-floating inside tubular handguard |
| Installation | No gunsmithing; front rail stays on for field-stripping |
| Stock | Folding-stock compatible |
| Reusable | Can be reinstalled on a new carbine |
Compatibility
Designed for compact AKSU-type sporting platforms. See the compatibility filter on this page to confirm fitment for your specific platform.
What's Included
- (1) SAG MK4 Chassis
- (1) Mounting Hardware Set
- (1) Installation Manual
FAQ
Q: Does it free-float the barrel?
A: Yes – the chassis fully free-floats the barrel inside a tubular handguard.
Q: What does installation require?
A: Removing the factory receiver cover, gas tube, and handguard. No permanent modification to the carbine, and installation follows the included manual.
Q: What is the rear rail for?
A: The removable rear cover section has its own 1913 segment for optics that don't need to retain zero – like a magnifier or a night-vision attachment.
Q: Can I move it to another carbine later?
A: Yes – the chassis can be reinstalled on a new carbine.
Q: How does shipping work?
A: US orders are fulfilled and delivered through our partner's domestic US logistics network. Delivery is not express, but it is reliable and fully guaranteed.
Build Out Your Compact Platform
? In Stock ? Guaranteed US Delivery ? CNC-Machined Quality
SAG Specs
General
Mounting & Rails
Recommended
SAG, Sureshot Armament, MK4 Chassis, Chassis, AKSU, Free-Float, 1913 Rail, Top Monorail, Tubular Handguard, Optic Mount, Chassis Systems, Bazalet