Chassis Accessories & ARCA Rails
A chassis is a platform, and accessories are how you make it yours. ARCA rails for tripods and bipods, weights for balance and recoil control, and the stops, bridges and length of pull parts that dial in your fit. We machine our own Pete's Pillars ARCA rail upgrades and M-LOK weights in the USA, and as an authorized dealer for MDT, KRG, Magpul, Ergo and Midwest Industries, we carry the accessories for the chassis our customers run most.
Shop ARCA RailsShop by Type
ARCA rails, weights, stops and the parts that dial in your chassis.
ARCA Rails
Full-length and M-LOK ARCA rails from Pete's Pillars and MDT, plus KRG ARCA spigots. Clamp to a tripod or ARCA bipod.
Shop ARCA RailsChassis Weights
Exterior M-LOK forend weights, interior forend weights, tip weights and buttstock weights to tune balance and recoil.
Shop WeightsBarricade Stops
Ergo and Midwest Industries M-LOK barricade and hand stops for positional shooting.
Shop Barricade StopsBridges & Controls
MDT ACC Elite control and night vision bridges in multiple colors.
Shop BridgesButtstocks & Length of Pull
KRG tool-less length of pull kits and the MDT SRS-X skeleton buttstock.
Shop LOP & ButtstocksSpigots & Mounts
KRG spigots in standard, ARCA and XL for bipods and optics, plus the MDT LRA S90 bracket.
Shop SpigotsSide Panels & Covers
MDT Oryx replacement side panels in camo and color, and KRG Bravo buttstock hooks.
Shop PanelsThumb Rests & Hardware
M-LOK thumb rests, sling studs and chassis screws.
Shop HardwareFind your upgrade.
Our own ARCA rail, M-LOK weights and Oryx upgrades, machined to tune how your chassis balances, mounts and settles after every shot.
Shop by Chassis
Panels, bridges and parts made for specific chassis.
Shop by Brand
Our own accessories, plus the brands we stock and support.
Pete's Pillars
Made in the USA. ARCA rail upgrades, M-LOK forend weights and Oryx buttstock weights.
Shop Pete's PillarsMDT
Oryx panels, ACC Elite bridges, forend weights, thumb rests, ARCA rails and the SRS-X buttstock.
Shop MDT AccessoriesKRG
Spigots, ARCA spigots, tool-less length of pull kits and Bravo and X-Ray accessories.
Shop KRG AccessoriesMagpul
M-LOK bipod rails and QD sling studs, including for the Victor Titan chassis.
Shop MagpulErgo
The Ergo Grip M-LOK barricade stop.
Shop ErgoMidwest Industries
M-LOK barricade and hand stops plus Picatinny rail sections.
Shop Midwest IndustriesUpgrade the Rifle
Chassis, bipods and parts that pair with your accessories.
Accessories & Gear
Bags, stock fit and support gear for the finished rifle.
Weight Where You Want It
Where the weight sits changes how a chassis rifle recoils and tracks. Our exterior M-LOK forend weights, in 6 oz mini and 12.3 oz pairs, bolt on where you need them and come off just as easily, so you can tune the rifle for the bench, the barricade or the field.
Choosing Chassis Accessories
ARCA rails
An ARCA rail turns your forend into a sliding mount for tripods and ARCA bipods. Full-length rails give the most adjustment, while short M-LOK ARCA sections add mounting points where you need them. ARCA is the standard for PRS and positional shooting.
Weights and balance
Added weight reduces felt recoil and helps the rifle settle after the shot. Forend weight moves the balance point forward for steadier bipod and barricade work, and buttstock weight balances a heavy barrel or suppressor.
Fit and control
Length of pull kits, thumb rests and control bridges let you set up a consistent grip and cheek weld. Barricade stops give you a positive stop against props.
Match the chassis
M-LOK accessories fit most modern forends, but panels, bridges, spigots and buttstock parts are made for specific chassis. Check fitment in each listing before ordering.
Chassis Accessories FAQ
What is an ARCA rail?
ARCA is a dovetail-style rail standard borrowed from camera tripods. An ARCA rail on your forend lets you clamp the rifle to a tripod or ARCA bipod and slide it to the balance point you want.
Do chassis weights really help?
Yes, for many shooters. Extra weight reduces felt recoil and muzzle movement, which helps you spot your own impacts. Where you place it matters as much as how much you add.
Will M-LOK accessories fit my chassis?
M-LOK is a common standard, so M-LOK weights, stops and rails fit most forends that use it. Check that there is room in the slots you plan to use and that the hardware length suits your forend.
Will Pete's Pillars weights fit my chassis?
Our exterior forend weights mount to M-LOK and are made to fit MDT forends. Check the fitment notes in each listing for your chassis.
Keep Building
More from the bench.
Rifle Chassis
MDT, KRG, XLR, Grey Birch and Victor Titan chassis for rimfire and centerfire rifles.
Shop Rifle ChassisRifle Bipods
MDT Ckye-Pod, GRND Pod and Oryx bipods plus Magpul and Warne bipod rails.
Shop BipodsScope Mounts & Rails
Pete's Pillars CZ 457 rails plus ARCA, M-LOK and Picatinny rails.
Shop RailsShop All Brands
Every manufacturer we carry in one place, from MDT and Volquartsen to our own USA-made parts.
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