Short answer: a stripped lower is the bare, serialized receiver; you add the parts kit, trigger, grip, buffer system and stock yourself. A complete lower comes assembled, usually with grip, stock and buffer system, and only needs an upper. Buy stripped if you want to choose every part and enjoy building; buy complete if you want it done or are new to it. Either way, the lower is the part federal rules treat as the firearm, so it goes through a dealer with a background check.
Stripped vs complete lower receiver
| Stripped lower | Complete lower | |
|---|---|---|
| What you get | The bare serialized receiver | Receiver with parts kit and trigger installed; often grip, stock and buffer system |
| What you still need | Lower parts kit, trigger, grip, buffer tube, buffer, spring, stock, tools | An upper |
| In-stock listings, 18 Oct 2026 | 24, from $61.87 (median about $215) | 13, from $147.89 (median $535) |
| Best for | Choosing every part; building it yourself | A quick, assembled build |
| Transfer | Through a dealer (FFL), Form 4473 and background check | Same |
Prices are a snapshot of in-stock AR-15 lowers in our catalog whose names say "stripped" or "complete", on 18 October 2026; they change daily. Complete lowers vary a lot in what they include, so check each listing. For a running total of a whole rifle, see our AR-15 build cost index.
What a stripped lower needs
- A lower parts kit; many leave out the trigger so you can fit your own (see best triggers).
- A pistol grip, if the kit has none.
- A buffer tube, castle nut, end plate, buffer, spring and stock: a complete stock kit has them all.
- Basic tools and patience: our lower assembly guide walks through it.
Buying either one: the lower is the firearm
ATF's regulation identifies the AR-15's receiver as "the lower part of the weapon that provides housing for the trigger mechanism and hammer". So a stripped lower is a firearm just like a complete one: buying from a dealer means a Form 4473 and a background check, and if you buy online it ships to a licensed dealer near you. Federal law also limits buying from out of state: unlicensed people generally cannot bring home a firearm obtained in another state except through the in-person rifle and shotgun rules or a dealer. State laws add more; see our California, New York and New Jersey guide. Unfinished 80% lowers are a separate topic: see 80% lowers explained.
Which should you buy?
- Stripped if you want to choose every part, already have tools, or want an ambidextrous or billet receiver.
- Complete if you want it ready to pair with an upper, or you would rather not fit roll pins and detents.
- Weighing a shop build instead? See build it yourself or buy.
Stripped lowers, with today's prices
Lowest price across the stores we track:
Griffin Armament MK2 Ambi stripped lower
Pros
- Forged 7075-T6, Type 3 hardcoat
- Ambidextrous bolt catch and release
Cons
- No right-side magazine release button included
Ambidextrous
One Horse OH-15 multi-caliber stripped lower
Pros
- Multi-caliber marked stripped lower
Cons
- Needs every lower part
Stripped
Diamondback DB15 multi-caliber stripped lower
Pros
- Multi-caliber marked stripped lower
Cons
- Needs every lower part
Stripped
Complete lowers, with today's prices
BCM Gunfighter complete lower with SOPMOD stock
Pros
- Listed with a SOPMOD stock
- Ready for an upper
Cons
- Check the listing for buffer and trigger details
Complete
One Horse OH-15 multi-caliber complete lower
Pros
- Assembled multi-caliber lower
Cons
- Check the listing for what is included
Complete
Griffin MK2 complete lower, Mod-0
Pros
- Assembled Griffin MK2 lower
Cons
- Check the listing for what is included
Complete
Compare every lower receiver by price, and plan the rifle in the AR-15 builder.
Frequently asked questions
What is a stripped lower receiver?
The bare, serialized lower receiver with no parts installed. It is the part ATF treats as the AR-15's receiver.
What comes with a complete lower?
The receiver with its parts kit and trigger installed, and often a grip, stock and buffer system. Contents vary, so check the listing.
Is it cheaper to build a stripped lower?
It can be, if you shop for parts, but complete lowers start low too: in our catalog on 18 October 2026, stripped lowers started at $61.87 and complete lowers at $147.89.
Do I need an FFL to buy a stripped lower?
Yes. The lower is the firearm, so a dealer transfer, Form 4473 and background check apply, just as for a complete lower or rifle.
Can I ship a stripped lower to my house?
Generally not from a seller in another state; it ships to a licensed dealer, who completes the transfer. State laws can add more steps.
How hard is it to assemble a lower?
Most people can do it with basic tools and patience; the trigger guard roll pin and the small detents are the fiddly parts. See our lower assembly guide.
