Description
Fierce Firearms built their reputation on ultra-light, sub-half-MOA hunting rifles, and the LACHSBL Chassis Kit lets you start a build around the same folding chassis platform found on their Reaper line. Finished in black and cut for long-action receivers, it's a modular skeleton meant to host a barreled action and the accessories you choose, giving you a stable, packable base whether you're chasing distance at the range or ounces on the mountain.
What the LACHSBL Chassis Kit Brings to a Build
This is the folding-chassis architecture Fierce uses to bridge the gap between a true long-range precision rifle and something you can actually carry into the backcountry. The forend runs M-LOK slots for slings, bipods, and lights, plus a section of Swiss Arca rail that makes tripod work and load-in-a-bipod positioning quick. The buttstock folds to keep the package compact for transport, and the adjustable cheek piece lets you dial in a repeatable head position behind your optic. Up front, the action seats in a machined bedding block that keeps the barreled action locked in for consistent shot-to-shot contact.
Fitment and Feeding on the LACHSBL Long Action
The LACHSBL is spec'd for AR-15 long-action pattern receivers, so confirm your barreled action matches that footprint before you commit. The chassis feeds from detachable magazines and takes a standard AR-style pistol grip, so you can tailor the grip angle and texture to your hand. Since Fierce cuts this platform for their own actions, it pays to verify inlet and magazine fitment against your specific receiver rather than assuming a universal drop-in.
Building Around the LACHSBL Chassis
Keep in mind this is the chassis kit only. There's no barreled action, optic, magazine, or muzzle device in the box, which is exactly the point for anyone assembling a rifle to their own spec. Pair it with a compatible long-action barreled action, add your glass and a bipod, and you've got the bones of a rifle that carries light and shoots straight.
Key Specifications
- Manufacturer: Fierce Firearms
- Manufacturer Part Number: LACHSBL
- UPC: 853418803950
- Product Type: Rifle Chassis Kit
- Finish: Black
- Fitment: AR-15 Long Action pattern receivers
- Stock Type: Folding chassis with adjustable cheek piece
- Forend: M-LOK slots with Swiss Arca rail
- Grip: AR-style pistol grip compatible
- Magazine: Detachable box magazine
What’s Included
- Fierce Firearms LACHSBL long-action chassis kit (black)
Frequently Asked Questions
What does the LACHSBL Chassis Kit actually come with?
This listing is for the chassis kit only. It does not include a barreled action, optic, magazine, bipod, or muzzle device. It's meant to be the foundation you build your own precision rifle around using components you select.
What actions does the Fierce LACHSBL chassis fit?
It's spec'd for long-action pattern receivers in the AR-15 long-action footprint Fierce lists. Because chassis inlets can be picky, it's smart to verify your barreled action and recoil lug match the fitment before ordering. If you're unsure about your specific receiver, confirm with the manufacturer first.
Does the LACHSBL chassis have a folding stock and rail options?
Yes. It uses the folding chassis design from Fierce's Reaper platform, so the buttstock folds for compact transport and the cheek piece adjusts for a repeatable cheek weld. The forend carries M-LOK slots for slings and bipods plus a section of Swiss Arca rail for tripod work.
Do I need a gunsmith to install my action in the LACHSBL chassis?
Most chassis systems are designed to install with basic hand tools, and the action bolts down into a machined bedding block. That said, some actions with trigger hangers or non-standard lugs may need minor fitting. Take your time torquing everything and check magazine feeding before heading to the range.




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