Home > AR15 Parts > Lower Receiver Parts (LPK) > LOWER BUILD KITS

RTB Labeled LBK products contain industry leading Mil-Spec FCG and 7075 Buffer components.

Each Lower Build Kit will have the option to upgrade your grip and trigger guard to Magpul MOE, BCM, Hogue, etc.

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Tactical Sport SBA4 Lower Build Kit Tactical Sport SBA4 Pistol Lower Build Kit - Adjustable Pistol Brace
Our Price: $179.95
DEAL OF THE DAY: $159.95
IN STOCK
Tactical Sport SBA3 Lower Build Kit Tactical Sport SBA3 Pistol Lower Build Kit - Adjustable Pistol Brace
Our Price: $179.95
DEAL OF THE DAY: $169.95
IN STOCK
Tactical Sport Lower Build Kit UTG Stock Kit Tactical Sport AR-15 Lower Build Kit - M4 Stock
Our Price: $149.99
DEAL OF THE DAY: $92.00
IN STOCK
Complete Lower Parts Build Kit - Mission First Minimalist Stock FDE RTB Lower Build Kit - Mission First Minimalist Stock - FDE
Our Price: $189.99
SALE PRICE: $139.95
IN STOCK
Complete Lower Parts Build Kit - Mission First Minimalist Stock RTB Lower Build Kit - Mission First Minimalist Stock
Our Price: $189.99
SALE PRICE: $139.95
IN STOCK
Lower Build kit M4 Stock RTB Lower Build Kit - M4 Stock
Our Price: $189.99
SALE PRICE: $115.00
IN STOCK
Anderson Lower Build Kit w/ Ambi End Plate Anderson PISTOL Lower Build Kit w/ End Plate
MSRP $91.80
SALE PRICE: $89.95
(Out of Stock)
(1)
Anderson Lower Build Kit w/ Magpul Furniture Anderson Lower Build Kit w/ Magpul Furniture
MSRP $160.71
SALE PRICE: $139.95
(Out of Stock)
MOE Stock Nickel Teflon Lower Build Kit RTB Lower Build Kit - Magpul MOE Stock - Enhanced Nickel Teflon Trigger
Our Price: $200.00
SALE PRICE: $149.95
(Out of Stock)
(1)
Lower Build kit MOE Stock RTB Lower Build Kit - Magpul MOE Stock
Our Price: $200.00
SALE PRICE: $139.95
(Out of Stock)
Lower Build kit MOE Stock FDE RTB Lower Build Kit - Magpul MOE Stock FDE
Our Price: $200.00
SALE PRICE: $139.95
(Out of Stock)
Tactical Superiority Lower Parts Build Kit - Mission First Minimalist Stock Tactical Superiority Lower Build Kit - Mission First Minimalist Stock
Our Price: $179.99
SALE PRICE: $107.95
(Out of Stock)
(1)
Tactical Superiority Lower Parts Build Kit - Magpul MOE Stock Tactical Superiority Lower Build Kit - Magpul MOE Stock
Our Price: $179.99
SALE PRICE: $119.99
(Out of Stock)
Tactical Superiority Lower Parts Build Kit - Magpul MOE FDE Stock Tactical Superiority Lower Build Kit - Magpul MOE Stock FDE
Our Price: $179.99
SALE PRICE: $119.99
(Out of Stock)
TS Lower Build Kit UTG Stock Kit Tactical Superiority Lower Build Kit - UTG M4 Stock Kit
Our Price: $149.99
SALE PRICE: $89.95
(Out of Stock)
Tactical Superiority Lower Parts Build Kit - Mission First Minimalist Stock FDE Tactical Superiority Lower Build Kit - UTG M4 Stock Kit - FDE
Our Price: $159.99
SALE PRICE: $89.95
(Out of Stock)
Anderson Lower Build Kit Anderson AM-15 Standard M4 Lower Build Kit
Our Price: $98.00
SALE PRICE: $95.00
(Out of Stock)
Unbranded Pistol Lowe Build Kit STAB Unbranded Pistol Lower Build Kit - Strike STAB Pistol Brace
Our Price: $169.95
SALE PRICE: $109.99
(Out of Stock)
RTB SB-MINI Lower Parts Build Kit RTB Pistol Lower Build Kit - SB Tactical MINI Pistol Brace
Our Price: $189.99
SALE PRICE: $155.00
(Out of Stock)
SBA3 MOE Lower Build Kit MOE SB Tactical SBA3 Pistol Lower Build Kit - Adjustable Pistol Brace
Our Price: $199.99
SALE PRICE: $189.95
(Out of Stock)
SBA4 MOE Lower Build Kit MOE SB Tactical SBA4 Pistol Lower Build Kit - Adjustable Pistol Brace
Our Price: $199.99
SALE PRICE: $189.95
(Out of Stock)
(1)
SBA3  Lower Build Kit SB Tactical SBA3 Pistol Lower Build Kit - Adjustable Pistol Brace
Our Price: $179.95
SALE PRICE: $179.95
(Out of Stock)
SBA4  Lower Build Kit SB Tactical SBA4 Pistol Lower Build Kit - Adjustable Pistol Brace
Our Price: $179.95
SALE PRICE: $179.95
(Out of Stock)
Unbranded Lower Build Kit UTG Stock Kit Unbranded AR Lower Build Kit - UTG M4 Stock Kit
Our Price: $149.99
SALE PRICE: $99.99
(Out of Stock)
   
 

AR15 Rifle and Pistol Lower Receiver Parts Build Kits

We have a large selection of rifle and AR pistol Lower Parts Build Kits for your lower receiver. Lower Build Kits come with everything that a lower parts kit (LPK) comes with but they also include a Stock and a buffer tube kit or an adjustable pistol brace for AR pistol builds. Our lower build kits come with everything that you need to complete your stripped lower, other than the lower itself. All of our RTB branded build kits come with mil spec 7075 buffer tubes and mil spec lower parts. Our RTB pistol lower build kits come with either a 7075 pistol tube or an adjustable mil spec buffer tube. The base components that we use in our kits are sourced from military contractors and everything is made in the USA!

Shop our selection of lower kits that include all types of Magpul, SB Tactical and Mission First stocks and braces. Our rifle lower kits come with adjustable 6 position buffer tube kits and our pistol lower build kits come with 7075 robust pistol buffer tubes and pistol stabilizing braces. With all of our lower build kits you will have the option to select an upgraded round oversize Magpul MOE trigger guard or similar upgrades. You will also have the option of upgrading the grip! Shop with us today and find the exact lower build kit that you need to complete your AR rifle or AR pistol.

The Rifle or Pistol Lower Build Kits that start with RTB utilize our true Mil-Spec components that are sourced from well established .mil contractors. Right To Bear branded Lower Build Kits come with industry leading LPK components along with premium fire control group components. The price differences between our RTB kits and the other kits is due to the premium parts used. There's a night and day difference in look, feel and durability between our triggers and the other NON-RTB kits, such as Palmetto State Armory kits.
The Lower Build Kits that are not labeled "RTB" are still good kits and are comparable in quality to other major brands, such as PSA and Anderson Manufacturing.



Why are Right To Bear kits better than the majority?


The Fire Control Group components in our RTB branded kits are manufactured to the exact standards as government parts other than the dimensional differences to prevent auto or burst fire. They are Mil spec in processing and the materials used are based off the current Mil standards.