SOLG MK1 SBR — 5.56 NATO Short Barrel Rifle
About this product
The SOLG MK1 SBR from Sons of Liberty Gun Works delivers reliable performance in a compact 5.56mm package. California customers can purchase this NFA item through our FFL transfer process. With an 11.5-inch barrel and lifetime warranty, it’s built for serious use. Ships to all 50 states. Available nationwide.
SOLG MK1 SBR: Precision Engineering for California Shooters
When you’re looking for a short-barreled rifle that doesn’t compromise on quality or reliability, the SOLG MK1 from Sons of Liberty Gun Works stands out. This isn’t just another AR-platform SBR—it’s a purpose-built firearm designed by people who understand what shooters actually need. At 6 pounds 3.2 ounces, it strikes the perfect balance between manageable weight and solid construction. The hard coat anodized finish isn’t just for looks; it provides serious protection against the elements and daily wear.
What Makes the SOLG MK1 SBR Different
Most SBRs on the market are built from off-the-shelf parts with minimal attention to detail. The SOLG MK1 changes that approach completely. Sons of Liberty Gun Works starts with premium materials and applies manufacturing tolerances that exceed military specifications. The 11.5-inch barrel isn’t just cut down from a longer barrel—it’s specifically engineered for optimal ballistics and reliability at SBR lengths. The closed bolt semi-auto action runs cleaner and cooler than many competing designs, which means you get consistent performance round after round. This rifle feels solid in your hands because it’s built that way from the ground up.
California Ownership Considerations
For California residents interested in NFA items like this SBR, understanding the process is key. At calgunsdepot, we guide customers through every step of Form 4 transfers and compliance requirements. While California has specific regulations regarding SBRs, properly registered NFA items are legal to own and use at approved ranges. The SOLG MK1’s 5.56mm chambering makes it practical for both recreational shooting and serious training applications within state guidelines. We recommend pairing it with quality optics and a solid sling system for maximum utility.
Technical Specifications
- Manufacturer: Sons of Liberty Gun Works
- Model: SOLG MK1 SBR
- Caliber: 5.56mm
- Action: Semi-Auto, Closed Bolt
- Barrel Length: 11.5 inches
- Thread Pitch: 1/2×28
- Magazine Capacity: 30 rounds
- Weight: 6lb 3.2oz
- Finish: Hard Coat Anodized
- Warranty: Lifetime
Similar SBR Options
If you’re considering different SBR platforms, we carry several quality options. The Daniel Defense MK18 SBR offers similar 5.56mm performance with Daniel Defense’s renowned quality. For those interested in pistol-caliber options, the B&T APC9K SD SBR Kit provides suppressed-ready capability in 9mm. And if you’re looking for something truly unique, the FN PS90 SBR brings bullpup design to the NFA world.
The SOLG MK1 represents what happens when a manufacturer focuses on doing one thing exceptionally well. From the precisely machined upper and lower receivers to the properly gassed barrel system, every component works together to create a shooting experience that feels refined yet rugged. The 1/2×28 thread pitch accommodates most common muzzle devices, and the magazine well accepts standard AR-pattern magazines without modification. This is a rifle that will serve you well for years, backed by Sons of Liberty Gun Works’ lifetime warranty.
NFA-Regulated Firearm — ATF Form 4 Required
This is a short-barreled rifle (SBR) regulated under the National Firearms Act. Purchase requires an ATF Form 4 transfer, a $200 federal tax stamp, and approximately 30–120 days of ATF processing (eForm 4 is typically faster than paper). The firearm ships to a licensed FFL/SOT dealer of your choice; you take possession only after ATF approval.
SBRs are currently legal to own in most U.S. states. They remain prohibited or restricted for civilian possession in California, New York, New Jersey, Washington D.C., Hawaii, Iowa, Rhode Island, and Washington State. Check your state and local law before ordering. By placing an order you affirm that possession is lawful in your jurisdiction and that you are 21+ with no prohibiting factors under 18 U.S.C. §922(g).
Questions about Form 4, trust setup, or SOT transfer? Contact us before you order — we’ll walk you through it.
Frequently Asked Questions
What is the NFA process for purchasing this SBR?
Purchasing this SBR requires a Form 4 transfer through the ATF. You'll need to submit fingerprints, passport photos, and undergo a background check. We handle all paperwork through our FFL to ensure proper compliance.
How long does the approval process typically take?
Current ATF processing times for Form 4 transfers average 6-9 months for individual applications. Trust applications may process slightly faster. We provide status updates throughout the waiting period.
How do you ship NFA items to California?
We ship all NFA items directly to your chosen California FFL holder. The firearm remains at their location until your Form 4 receives ATF approval. We coordinate with FFLs statewide for smooth transfers.
What are good uses for a 5.56mm SBR?
The 5.56mm chambering makes this SBR versatile for range training, competition, and defensive applications. The 11.5-inch barrel maintains effective velocity while providing superior maneuverability in close quarters.
Specs at a glance
Key attributes
| Weight | 6lb 3.2oz |
| Manufacturer | Sons of Liberty Gun Works |
| Caliber | 5.56mm |
| Action | Semi-Auto; Closed bolt |
| Barrel | 11.5 |
| Thread Pitch | 1/2x28 |
| Magazine | 30 |
| Finish | Hard Coat Anodized |
| Warranty | Lifetime |