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// SOT Custom Shop
Custom Shop
Custom rifles and pistols built from OE components into variants no factory offers — and gunsmithing services for the parts you already own, from pinning and welding a muzzle device to an LMT® MRP™ barrel conversion. All of it done to the same documented standard as every rifle we build.
- Custom rifles and pistols
- Gunsmithing services
- Order and pay online
// Second of Ten Custom Shop
Built to order. Built to standard.
The Custom Shop does two kinds of work. It builds custom rifles and pistols — our Samurai Series, the Quattro-15 Series and custom LMT® rifles and pistols among them. And it takes on gunsmithing for the parts you already own, from pinning and welding muzzle devices to LMT® MRP™ and MWS barrel conversions.
Every job, a complete rifle or a single barrel, is handled to the same documented standard as the rifles we build — inspected, and recorded before it ships.
// Custom builds
Rifles and pistols you can’t buy off the shelf
We build from OE components — receivers, barrels, triggers and gas systems from the makers we trust — combined into variants that aren’t available in any standard configuration. Each build answers a specific requirement, and in many cases it improves on the overall performance of the OEM version of the firearm it starts from.
// Custom build
Samurai Series
Limited-edition rifles built in small numbers, each named for its edition — the Yasuke Edition among them — and each with its own documented inspection record.
// Custom build
Quattro-15 Series
Built on the Desert Tech Quattro-15 lower, with configurations the factory rifle doesn’t offer — an HM Defense Monobloc® direct-impingement upper, or our QUATTRO-816 short-stroke piston upper.
// Custom build
Custom LMT® rifles and pistols
LMT® MRP™ and MWS rifles and pistols built around barrels and gas systems LMT® doesn’t catalog — a 6mm Max® with a SOLGW barrel and RIFLESPEED Gas Control, or an HM Defense Monobloc® converted for the MRP™.
Who warrants what. The complete firearm is backed by the Second of Ten warranty; each component maker warrants its own part. Warranty information.
// Services
Gunsmithing services
From pinning and welding muzzle devices to LMT® MRP™ and MWS barrel conversions — work on the parts you already own, at published prices, ordered and paid for online. We review every order before work starts, then email you how to send your parts.
// MRP™ $135 · MWS $175
LMT® MRP™ & MWS Barrel Conversion
Any AR-15 barrel converted for your LMT® MRP™, or any AR-10 barrel for a large-frame MWS. Optional gas block, muzzle device and matching headspaced bolt.
Turnaround: 2–3 weeks
// $65
Pin and Weld
Permanently attach a muzzle device to bring overall length to 16.0″, or for assault-weapon-law compliance. Removal of an existing pin and weld available.
Turnaround: A few days in the shop
// From $85
Barrel Shortening and Threading
Shorten (optional), crown and thread an AR-15 or AR-10 barrel — threads cut concentric to the bore and gauged. Other platforms on request.
Turnaround: 2–3 weeks
// $55
Gas Block Pinning
Barrel dimpled for the set screws and the gas block pinned to it — taking one of the most common field failures out of the gas system.
Turnaround: About a week
// $45
Feed Ramp Polishing
Rough or coarse feed ramps polished smooth for more consistent feeding. The surface is polished; the geometry is not changed.
Turnaround: A few days in the shop
// Quoted
Laser Engraving
Custom text, logos and markings laser engraved on receivers, handguards, suppressors and accessories. Quoted to the job.
Turnaround: Quoted
// How it works
Services: order, ship it in, done
1 · Order
Pick a service, choose your options and check out. Return shipping is calculated at checkout.
2 · We review it
We check the work is a fit before anything happens, then email you how to send your parts.
3 · Ship it in
Pack it the way we tell you, with your order number inside.
4 · Back to you
The work is done, inspected and recorded, and your parts ship back.
// Good to know
Where we can return barrels. We do not ship barrel assemblies to California, Connecticut, Delaware, the District of Columbia, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New York, Rhode Island or Washington, or to Denver, Colorado, or Cook County/Chicago, Illinois.
Your configuration. A barrel under 16″ on a rifle-configured firearm makes a short-barreled rifle. Since October 9, 2026, ATF no longer enforces NFA approval or registration for short-barreled rifles. That is an enforcement policy following the Jensen and Silencer Shop Foundation v. ATF rulings, not a change to the statute, and it could change. Taking an SBR across state lines still needs ATF approval on Form 5320.20, and state and local laws on short-barreled rifles still apply. The firearm’s configuration is the owner’s responsibility.
Second of Ten is not affiliated with or endorsed by the makers of any product named here. LMT®, MRP™ and MWS® are marks of Lewis Machine & Tool Company. Other product names are marks of their respective owners.