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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
Available Merchants(7)
Prices checked
Price Alert
October 2026 so far on GunPartPicker
Weaver Multi-Slot Base - 48400 is the most added optic mount on GunPartPicker so far in October 2026, ahead of the Geissele Automatics Super Precision AR-15/M4 30mm 7075 T6 Aluminum Extended Scope Mount, Hardcoat Anodized Black - 05381B, with about 31% of all optic mounts added to builds. That's its 6th straight month at #1. Builds with this optic mount are mostly chambered in 5.56 NATO (79%), mostly on mid-length gas (64%, then carbine-length 22%), and mostly AR-15 (94%).
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today all 7 retailers we track have it in stock. It dipped to $15.09 at BattleHawk Armory for a stretch in September 2026, under its usual $15.82, so sales do come around. Buying today, the lowest price is $14.76 at BattleHawk Armory, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by hundreds of builds that include this one
Smith & Wesson M&P15 Complete Lower 5.56x45mm/.223 Remington, Black - 812002
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
EOTECH 3x30.5mm X 21.6mm Holographic Hybrid Green Dot Sight - HHSGRN
Daniel Defense Collapsible Mil-Spec Buttstock, Brown - 21-091-04179-011
Bravo Company Manufacturing 5.56 NATO Mid-Length Bhf AR-15 Barreled Upper - MCMR-15 - 16"
Streamlight ProTac Rail Mount HL-X Laser 1000 Lumen Weapon Light with Tape Switch - CR123A
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.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Weaver Multi-Slot Base - 48400
| Build | Parts | Total |
|---|---|---|
 | 30 | $6527.42 |
 | 25 | $1749.89 |
 | 24 | $7067.20 |
 | 31 | $7687.40 |
 | 21 | $3824.36 |
 | 35 | $3442.78 |
 | 12 | $5417.82 |
| 24 | $5199.36 |
 | 25 | $5805.54 |
 | 25 | $533.28 |
 | 18 | $2790.34 |
 | 34 | $4807.03 |
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