Lower Parts
Looking to get new parts for your AR's lower receiver. This is the place to look, with hundreds of parts from stocks and grips to a new mag release button. Shop with Grid Defense to customize and build the best lower receiver you can. Make your firearm look, feel, and perform the best with our selection of OE and aftermarket parts.
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Grid Defense Mil-Spec Carbine Buffer Tube Assembly
$35.00Grid Defense Mil-Spec Carbine Buffer Tube Kit Made in the USA Compatible with M4 Type Butt Stocks 6 Position Carbine Buffer Tube Machined from 7075-T6 Aluminum End Plate Castle Nut Carbine Buffer Spring Carbine Buffer Weight: 9.75oz Hard Coat...$35.00 -
Out of stock
Tactical Dynamics Skeleton Grip - Black
$79.00Tactical Dynamics AR15 Skeletonized Grip - Black AR 15 Skeleton Grip Finished in a black cerakote...$79.00 -
Out of stockOn Sale
Grid Defense AR-15 80% Lower Receiver With Fire/Safe Engravings - Black
Sale: $55.00MSRP: $150.00Grid Defense AR-15 80% Lower Receiver With Fire/Safe Engravings - Black Machined from 7075-T6 Aluminum Forging 8625 Type III Hardcoat Anodize – Black Flared and broached magazine well Rear upper lug pocket cut out Fits all mil-spec upper...Sale: $55.00MSRP: $150.00 -
MIL-SPEC CARBINE BUFFER TUBE KIT WITH MAGPUL MOE CARBINE STOCK
$79.95MIL-SPEC CARBINE BUFFER TUBE KIT Made in the USA Compatible with M4 Type Butt Stocks 6 Position Carbine Buffer Tube Machined from 7075-T6 Aluminum End Plate Castle Nut Carbine Buffer Spring Carbine Buffer Weight: 9.75oz Hard Coat Black...$79.95 -
Magpul PMAG Gen M2 MOE 30rd .223/5.56 Magazine - Black
$12.95Magpul PMAG Gen M2 MOE 30rd .223/5.56 Magazine - Black 30-round reliability with no stoppages Flared floorplate aids magazine handling and disassembly and is slim enough for use with many double and triple pouches The anti-tilt, self-lubricating...$12.95 -
On Sale
MIL-SPEC CARBINE BUFFER TUBE KIT WITH TRINITY FORCE ALPHA STOCK
Sale: $39.99MSRP: $54.99MIL-SPEC CARBINE BUFFER TUBE KIT Made in the USA Compatible with M4 Type Butt Stocks 6 Position Carbine Buffer Tube Machined from 7075-T6 Aluminum End Plate Castle Nut Carbine Buffer Spring Carbine Buffer Weight: 9.75oz Hard Coat Black...Sale: $39.99MSRP: $54.99 -
Out of stockOn Sale
Tactical Dynamics Skeleton Stock - Black
Sale: $56.00MSRP: $109.00Tactical Dynamics Skeletonized Stock Made in the USA Black Cerakote Finish Machined from 6061-T6 Aluminum Minimalist Stock Compatible with Milspec Carbine Buffer Tubes Specs 6 3/4" Long 5 1/4" Contact Area 1 1/4" Wide 9.65ozSale: $56.00MSRP: $109.00 -
Out of stockOn Sale
Grid Defense AR-10 80% Billet Lower Receiver Without Fire/Safe - Black
Sale: $90.00MSRP: $225.00Grid Defense AR-10 80% Lower Receiver Without Fire/Safe - Black Machined from 6061-T6 Billet Aluminum Made in house in the USA Flared and Broached Magwell Finished in Hard Coat Black Anodize Does not have Fire/Safe Makings Compatible with DPMS...Sale: $90.00MSRP: $225.00 -
Out of stockOn Sale
Grid Defense AR-15 80% Lower Receiver With Fire/Safe Engravings 3 Pack - Black
Sale: $155.00MSRP: $400.00Grid Defense AR-15 80% Lower Receiver With Fire/Safe Engravings 3 Pack - Black Includes 3 80% Lower Receivers Machined from 7075-T6 Aluminum Forging 8625 Type III Hardcoat Anodize – Black Flared and broached magazine well Rear upper lug...Sale: $155.00MSRP: $400.00 -
Out of stockOn Sale
STRIKE INDUSTRIES ULTRA LIGHT PIVOT / TAKEDOWN PINS - BLACK
Sale: $14.35MSRP: $15.95STRIKE INDUSTRIES ULTRA LIGHT PIVOT/TAKEDOWN PINS - BLACK Finished in Anodized Black Extended grasping surface Extended pivot pin / 1.31" length Extended takedown pin /1.08" length For AR-15 lowers Ultra light and ultra strong constructionSale: $14.35MSRP: $15.95 -
Out of stockOn Sale
SB Tactical SBA3 Adjustable Pistol Brace With Grid Defense Buffer Tube Kit - Black
Sale: $119.95MSRP: $169.95SBA3 With Grid Defense Buffer Kit - Black SB Tactical SBA3 Pistol Stabilizing Brace Complete Grid Defense Buffer Tube Assembly Kit Carbine buffer (3 oz) Carbine buffer spring Carbine stock end plate Carbine stock lock ring-castle nutSale: $119.95MSRP: $169.95 -
On Sale
GHOST MIL-SPEC CARBINE BUFFER TUBE KIT WITH M4 STOCK
Sale: $35.99MSRP: $53.00Ghost Mil-Spec Carbine Buffer Tube Kit Made in the USA Compatible with M4 Type Butt Stocks 6 Position Carbine Buffer Tube Machined from 7075-T6 Aluminum End Plate Castle Nut Carbine Buffer Spring Carbine Buffer Weight: 9.75oz Hard Coat Black...Sale: $35.99MSRP: $53.00 -
Out of stockOn Sale
Grid Defense AR-9 80% Lower Receiver Without Fire/Safe Engravings - Black
Sale: $79.99MSRP: $179.00Grid Defense AR-9 80% Lower Receiver - Black Finished in hard coat black anodize Machined from 6061 billet aluminum Compatible with any Glock style small frame pistol calibers Compatible with Glock pattern or style magazines Magazine release...Sale: $79.99MSRP: $179.00 -
Skeletonized Elite Trigger Guard
$24.99Premium Skeletonized Elite Trigger Guard This Skeletonized trigger guard is the premium option from the Vital trigger guard that comes standard with all completed lowers. With it's slim design, it offers coverage where it is needed serving its...$24.99 -
On Sale
SB Tactical SBA4 Adjustable Pistol Brace With Grid Defense Buffer Tube Kit - Black
Sale: $119.95MSRP: $169.95SBA4 with Grid Defense Buffer Kit - Black SB Tactical SBA4 Pistol Stabilizing Brace Complete Grid Defense Buffer Tube Assembly Kit Carbine buffer (3 oz) Carbine buffer spring Carbine stock end plate Carbine stock lock ring-castle nutSale: $119.95MSRP: $169.95 -
STRIKE INDUSTRIES ULTRA LIGHT PIVOT / TAKEDOWN PINS - BLUE
$16.95STRIKE INDUSTRIES ULTRA LIGHT PIVOT AND TAKEDOWN PINS - BLUE Billet 7075 aluminum Blue Finish Extended grasping surface Extended pivot pin / 1.31" length Extended takedown pin /1.08" length For AR-15 lowers Ultra light and ultra strong...$16.95 -
Out of stockOn Sale
Grid Defense AR-15 80% Lower Receiver With Optional Fire/Safe Engravings
$55.00 - $70.00Grid Defense AR-15 80% Lower Receiver With Optional Fire/Safe Engravings Machined from 7075-T6 Aluminum Forging Flared and broached magazine well Rear upper lug pocket cut out Fits all mil-spec upper receivers Made in the USA Choose from our...$55.00 - $70.00 -
Out of stock
TIMBER CREEK AMBIDEXTROUS SAFETY SELECTOR - BLACK
$39.00AMBIDEXTROUS SAFETY SELECTOR - BLACK Drop in replacement for any milspec lower For both left and right hand shooters Made in the USA Manufactured by Timber Creek Outdoors$39.00 -
Magpul MOE Polymer Trigger Guard - Black
$9.95Magpul MOE Polymer Trigger Guard - Black Constructed from Advanced Polymer Compatible with the AR15/M4 Platform All Mounting Hardware Included Made in the USA Easily installed without the use of specialized tools Ergonomic and enlarged...$9.95 -
On Sale
Grid Defense AR10/.308 Mil-Spec Carbine Buffer Tube Assembly
Sale: $44.99MSRP: $54.99Grid Defense AR-10/.308 Mil-Spec Carbine Buffer Tube Kit Made in the USA Compatible with M4 Type Butt Stocks 6 Position Carbine Buffer Tube Machined from 7075-T6 Aluminum End Plate Castle Nut .308 Carbine Buffer Spring .308 Carbine Buffer (3...Sale: $44.99MSRP: $54.99