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

RTB 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 largely due to the premium parts used in our kits. There's a night and day difference in look, feel and durability between our triggers and the other NON-RTB kits.

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Tactical Superiority Lower Parts Build Kit - Mission First Minimalist Stock FDE Tactical Superiority Lower Parts Build Kit - UTG M4 Stock Kit - FDE
Our Price: $159.99
Deal of the day: $84.95
IN STOCK
Complete Lower Parts Build Kit - Mission First Minimalist Stock FDE RTB Lower Parts Build Kit - Mission First Minimalist Stock - FDE
Our Price: $189.99
SALE PRICE: $114.95
IN STOCK
Anderson Lower Build Kit w/ Ambi End Plate Anderson PISTOL Lower Build Kit w/ End Plate
MSRP $91.80
SALE PRICE: $89.99
IN STOCK
Complete Lower Parts Build Kit - Mission First Minimalist Stock RTB Lower Parts Build Kit - Mission First Minimalist Stock
Our Price: $189.99
SALE PRICE: $114.95
IN STOCK
Lower Build kit MOE Stock FDE RTB Lower Parts Build Kit - Magpul MOE Stock FDE
Our Price: $200.00
SALE PRICE: $114.95
IN STOCK
Tactical Superiority Lower Parts Build Kit - Magpul MOE Stock Tactical Superiority Lower Parts Build Kit - Magpul MOE Stock
Our Price: $179.99
SALE PRICE: $99.99
IN STOCK
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 Parts Build Kit - Magpul MOE Stock - Enhanced Nickel Teflon Trigger
Our Price: $200.00
SALE PRICE: $124.95
(Out of Stock)
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Lower Build kit MOE Stock RTB Lower Parts Build Kit - Magpul MOE Stock
Our Price: $200.00
SALE PRICE: $114.95
(Out of Stock)
Tactical Superiority Lower Parts Build Kit - Mission First Minimalist Stock Tactical Superiority Lower Parts Build Kit - Mission First Minimalist Stock
Our Price: $179.99
SALE PRICE: $99.99
(Out of Stock)
(1)
Lower Build kit M4 Stock RTB Lower Parts Build Kit - M4 Stock
Our Price: $189.99
SALE PRICE: $107.95
(Out of Stock)
TS Lower Build Kit UTG Stock Kit Tactical Superiority Lower Parts Build Kit - UTG M4 Stock Kit
Our Price: $149.99
SALE PRICE: $84.95
(Out of Stock)
   
 

AR15 Lower Receiver Parts Build Kits

We have a large selection of Lower Parts Build Kits for your 80% or serialized lower receiver. Lower Parts Build Kits come with everything that a lower parts kit (LPK) comes with but they also include a Stock and a buffer tube kit. Our lower build kits come with everything that you need to complete your 80 percent lower, other than the lower itself. All of our build kits come with mil spec 7075 buffer tubes and mil spec lower parts. 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 and Mission first stocks. 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 stabalizing braces. With all of our lower build kits you will have the option to select an upgraded round oversize magpul 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.