The Atlas BT43 Leveraged Rail, part number BT43 from B&T Industries, is the BT20-B AAIS bottom rail supplied with an American Defense ADM-170-S lever mount already installed. It is a ready-made quick-detach interface for spigot-equipped rifles, with no separate parts to source or assemble.
How It Compares
Buying the Atlas BT20-B AAIS bottom rail and an American Defense ADM-170-S Picatinny lever mount separately gets you to the same place; the BT43 is that combination supplied ready to fit. If you want plain rails without a lever, the Atlas BT20 AAIS 1913 rail set is the three-piece option, and the spigot itself is the Atlas BT19 Accuracy International spigot. Bipods are in our Atlas bipod range.
Ideal For
- Accuracy International rifles where the bipod comes off for transport
- Long-range and PRS-style shooting on an AI platform
- Deer stalkers who case the rifle for the walk in
- Shooters who want the quick-detach lever supplied ready-installed
Key Features
-
Type: Leveraged rail — BT20-B bottom rail with ADM-170-S lever installed
-
Mount: American Defense ADM-170-S quick-detach lever, MIL-STD-1913 Picatinny
-
Purpose: Ready-made quick-detach interface for spigot-equipped rifles
-
Related: BT19 AAIS spigot; BT20 three-piece rail set; BT20-B bottom rail alone
-
Origin: Genuine B&T Industries, LLC — Made in USA
Technical Specifications
| Type |
Leveraged rail (BT20-B bottom rail + ADM-170-S lever) |
| Mount |
American Defense ADM-170-S lever quick-detach, 1913 Picatinny |
| Related Parts |
BT19 AAIS spigot; BT20 rail set; BT20-B bottom rail |
| Brand |
B&T Industries, LLC — Made in USA |
| SKU / MPN / UPC |
BT43 / BT43 / 810040220333 |
What's Included
- 1× Atlas BT20-B bottom rail
- 1× American Defense ADM-170-S lever mount, installed
UK Delivery & Support
This Atlas rail is imported from the USA, duty paid by us, and dispatched tracked from the UK — nothing to pay on delivery — and is backed by UK-based aftersales support.
Frequently Asked Questions
What exactly is the Atlas BT43 leveraged rail?
The BT43 is the BT20-B AAIS bottom rail supplied with an American Defense ADM-170-S lever mount already installed, so it arrives as a complete quick-detach interface.
Do I still need the BT19 spigot with the BT43?
The BT43 is the rail and lever assembly for the Accuracy International spigot system, so the BT19 spigot is the part that provides that interface on the rifle.
Can I build the same thing from separate parts?
Yes — the BT20-B bottom rail and an ADM-170-S lever mount bought separately produce the same assembly, and the BT43 simply supplies them together and installed.
Which bipods work with the BT43?
The ADM-170-S lever accepts the 17S-size Atlas bipods, which covers the V8, PSR, CAL and Super CAL models in their NC form as well as any bipod already carrying a compatible interface.
What is in the box?
The box contains one Atlas BT20-B bottom rail with an American Defense ADM-170-S lever mount installed.
