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
August 2026 on GunPartPicker
Weaver Multi-Slot Base - 48400 was the most added optic mount on GunPartPicker in August 2026, ahead of the Geissele Automatics Super Precision AR-15/M4 30mm 7075 T6 Aluminum Extended Scope Mount, Hardcoat Anodized Black - 05381B, with about 33% of all optic mounts added to builds. That's its 4th straight month at #1. Builds with this optic mount are mostly chambered in 5.56 NATO (76%), mostly on mid-length gas (64%, then carbine-length 23%), and mostly AR-15 (88%, then AR-10 9%).
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 6 of the 7 retailers we track have it in stock. It dipped to $14.76 at BattleHawk Armory for a stretch in August 2026, under its usual $15.82, so sales do come around. Buying today, the lowest price is $15.09 at BattleHawk Armory.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
Not sure which optic mount to pick?
We ranked every optic mount by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Optic Mount Guide →Frequently Built With
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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.
88.1%
AR-1588.1%
AR-109%
AR-93%
CaliberBased on real build data showing which calibers builders choose alongside this product.
75.6%
5.56 NATO75.6%
.223 Wylde7.3%
300 Blackout4.9%
.308 Win4.9%
7.62x39mm2.4%
Other4.8%
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
64.1%
Mid-Length64.1%
Carbine23.1%
Rifle12.8%
Builds Featuring This Part
See all 26 →Builds in the community that include the Weaver Multi-Slot Base - 48400
| Build | Parts | Total |
|---|---|---|
 | 30 | $6230.88 |
 | 25 | $1851.84 |
 | 24 | $6998.58 |
 | 31 | $7348.24 |
 | 21 | $3821.23 |
 | 35 | $3413.86 |
 | 12 | $5406.63 |
| 24 | $5204.22 |
 | 25 | $5515.39 |
 | 25 | $787.29 |
 | 18 | $2838.85 |
 | 34 | $4792.04 |
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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