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MCS

CAA

JE Machine tech

Trinity Force

UTG Leapers

Elite Tactical Systems Group

Mission First Tactical

SB Tactical

Holosun

Black Spider LLC

Endo

Eotech

LBE Unlimited

Presma

Sig Sauer

Sight Mark

View all Brands

MCS Gear-up has the lower parts needed to assemble a stripped lower receiver. Our MIL-SPEC parts are precision machined for a drop-in fit with nearly all lower receivers on the market. Enjoy Free shipping and returns on all orders as well as our 100% customer satisfaction guarantee!

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.223/5.56 Stock Receiver End Plate & Castle Nut

MSRP: $15.99

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Now: $9.99

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.223/5.56 Takedown Pin Front & Rear Set Quick Pull

MSRP: $18.99

Was:

Now: $10.99

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.223/5.56/308 Castle Lock Nut - Made in USA

MSRP: $15.99

Was:

Now: $8.99

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.223/5.56/308 Castle Lock Nut - Tan

MSRP: $17.99

Was:

Now: $10.99

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3oz Recoil Buffer For Model AR15 Carbine

MSRP: $19.99

Was: $13.95

Now: $6.95

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AR-15 3oz Recoil Buffer For Model AR15 Carbine (TAN)

MSRP: $19.99

Was: $13.99

Now: $8.99

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AR-15 Bolt Catch Assembly Kit with Plunger, Spring & Roll Pin -Black

MSRP: $19.99

Was:

Now: $15.99

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AR-15 Bolt Catch Assembly Kit with Plunger, Spring & Roll Pin -Tan

MSRP:

Was:

Now: $16.99

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AR-15 Carbine Length Buffer Spring - Steel

MSRP: $9.99

Was:

Now: $6.99

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AR-15 Extended Bolt Catch Release Lever

MSRP: $25.99

Was: $20.99

Now: $18.99

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Lower Parts Kit w/ Standard Grip & Trigger Guard - LPK

MSRP: $55.99

Was: $50.99

Now: $45.99

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Magazine Catch Assembly w/Button and Spring

MSRP: $13.99

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Now: $9.99

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.223/5.56 Stock Receiver End Plate & Castle Nut

Features Trinity Force .223/5.56 Stock Receiver End Plate Trinity force Castle Nut Lifetime warranty

MSRP: $15.99

Was:

Now: $9.99

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.223/5.56 Takedown Pin Front & Rear Set Quick Pull

The Takedown Pin Set is compatible with any standard receiver and includes both the front pivot pin and the rear takedown pin. The pin heads also have oversized knobs for easy grip and are cross drilled to accommodate pull rings for increased leverage...

MSRP: $18.99

Was:

Now: $10.99

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.223/5.56/308 Castle Lock Nut - Made in USA

Features: Precision machined surfaces Non-sharp edges ensure proper threading Lifetime Warranty USA Made

MSRP: $15.99

Was:

Now: $8.99

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.223/5.56/308 Castle Lock Nut - Tan

Features: Precision machined surfaces Non-sharp edges ensure proper threading Lifetime Warranty Tan

MSRP: $17.99

Was:

Now: $10.99

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3oz Recoil Buffer For Model AR15 Carbine

Features: Complete with 3 Steel Weights Reinforced Buffer Body with Hardcoat Anodizing Tight Fit Buffer Bumper Total 3.0 oz Material: Aluminum/Plastic Height: 3.26" Weight: 3.0 oz Color: Black Lifetime Warranty

MSRP: $19.99

Was: $13.95

Now: $6.95

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AR-15 3oz Recoil Buffer For Model AR15 Carbine (TAN)

This carbine length collapsible stock buffer assembly provides smoother function and helps to noticeably reduce felt recoil. Features: 3 oz. Length: 3.25" Tan finish Drop-in installation Fits: AR-15

MSRP: $19.99

Was: $13.99

Now: $8.99

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AR-15 Bolt Catch Assembly Kit with Plunger, Spring & Roll Pin -Black

Our standard AR-15 Bolt Catch Assembly is constructed of hardened steel and machined to precise Mil-Spec dimensions. Features: Mil-Spec Steel construction Matte Black finish Includes roll pin, plunger and spring Fits: AR-15

MSRP: $19.99

Was:

Now: $15.99

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AR-15 Bolt Catch Assembly Kit with Plunger, Spring & Roll Pin -Tan

Our standard AR-15 Bolt Catch Assembly is constructed of hardened steel and machined to precise Mil-Spec dimensions. Features: Mil-Spec Steel construction Matte Tan finish Includes roll pin, plunger and spring Fits: AR-15

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Now: $16.99

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AR-15 Carbine Length Buffer Spring - Steel

This steel buffer tube spring measures 10.75" long and fits carbine AR-15 buffer tubes. It's lightweight and pre-loaded for maximum efficiency and durability. Features: Length: 10.75" Weight: 1.9 oz Solid steel construction Corrosion resistant...

MSRP: $9.99

Was:

Now: $6.99

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AR-15 Extended Bolt Catch Release Lever

This extended lever attaches to the bolt catch and extends into the trigger guard, allowing ambidextrous operation of the bolt catch with the trigger finger. Features: Mil-Spec Ambidextrous 6061-T6 Aluminum Black Anodized finish Fits: AR-15

MSRP: $25.99

Was: $20.99

Now: $18.99

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Lower Parts Kit w/ Standard Grip & Trigger Guard - LPK

Our AR-15 Lower Receiver Parts Kits (LPK's) include everything you'll need to put together a well-functioning and sleek Lower. The solid steel Trigger and Hammer are made in the U.S.A. and each of the pieces are also available separately. The standard...

MSRP: $55.99

Was: $50.99

Now: $45.99

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Magazine Catch Assembly w/Button and Spring

This is our standard Mil-Spec AR-15 Magazine Catch Kit. Included is the mag catch, release button and spring. Each piece is finished in a matte black. Includes: Magazine Catch Magazine Catch Button Magazine Catch Spring Fits: AR-15

MSRP: $13.99

Was:

Now: $9.99

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