B
b00st3824good upgrade
Reviewed on May 12, 2026Verified with Build
good optic. eye box is tighter than i expected
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Weaver Multi-Slot Base - 48400
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Weaver
Overview
The Weaver Multi-Slot Base - 48400 is a versatile scope base designed for use on Picatinny rails, providing a stable platform for mounting optics. Its multi-slot design allows for adjustments in eye relief and positioning, making it adaptable to various shooting styles and preferences. This scope base is commonly found in builds utilizing a mid-length gas system chambered in 5.56 NATO, where precision and flexibility in optics placement are key for effective targeting.
Specifications
MPN48400
Mount TypeScope Base
Mounting InterfacePicatinny
Frequently Built With
Based on build data
NcStar Pro Series Sight Front/Rear Flip Up, Black - VMARFLC
Geissele Automatics Llc Ar-15 Ssa-E X Lightning Bow Trigger
Magpul AFG-2 Angled Fore Grip - Black
Streamlight ProTac Rail Mount HL-X Laser 1000 Lumen Weapon Light with Tape Switch - CR123A
Eotech 3x30.5mm x 21.6mm Holographic Hybrid Green Dot Sight - HHSGRN
Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
87.3%
AR-1587.3%
AR-109.1%
AR-93.6%
CaliberBased on real build data showing which calibers builders choose alongside this product.
78.1%
5.56 NATO78.1%
.223 Wylde6.3%
.308 Win6.3%
.450 Bushmaster3.1%
.45 ACP3.1%
Other3.1%
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
65.6%
Mid-Length65.6%
Carbine21.9%
Rifle12.5%
| Product | Category | Times Built Together |
|---|---|---|
| NcStar Pro Series Sight Front/Rear Flip Up, Black - VMARFLC | 95 | |
| Geissele Automatics Llc Ar-15 Ssa-E X Lightning Bow Trigger | 82 | |
| Magpul AFG-2 Angled Fore Grip - Black | 62 | |
| Streamlight ProTac Rail Mount HL-X Laser 1000 Lumen Weapon Light with Tape Switch - CR123A | 58 | |
| Eotech 3x30.5mm x 21.6mm Holographic Hybrid Green Dot Sight - HHSGRN | 55 | |
| Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C | 51 |
| Platform | Percentage |
|---|---|
| AR-15 | 87.3% |
| AR-10 | 9.1% |
| AR-9 | 3.6% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 78.1% |
| .223 Wylde | 6.3% |
| .308 Win | 6.3% |
| .450 Bushmaster | 3.1% |
| .45 ACP | 3.1% |
| 300 Blackout | 3.1% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 65.6% |
| Carbine | 21.9% |
| Rifle | 12.5% |
Builds Featuring This Part
See all 26 →Builds in the community that include the Weaver Multi-Slot Base - 48400
| Build | Parts | Total |
|---|---|---|
 | 30 | $6263.05 |
 | 25 | $1847.86 |
 | 24 | $6862.15 |
 | 31 | $6891.70 |
 | 21 | $3410.84 |
 | 35 | $3101.98 |
 | 12 | $5486.14 |
| 24 | $4839.11 |
 | 25 | $5499.01 |
 | 25 | $1022.75 |
 | 18 | $2742.78 |
 | 34 | $4631.71 |
Customer reviews
4.0out of 5
2 global ratings
Top reviews
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xsimplejack627Weaver base battery rough
Reviewed on March 21, 2026Verified with Build
Weaver multi-slot base mounts solidly to my receiver. The mounting screws thread a bit rough into the base, took some patience to seat without cross threading. Once installed it holds zero through recoil. Standard Weaver dimensions.
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