User Ratings
No ratings yet
Be the first to review this product
Meprolight M21D4 M-21 1x 30mm objective unlimited eye relief red dot reflex sight. Dual illuminated, maintenance-free, no batteries required. Designed for rapid, instinctive firing. Pairs with Weaver or Picatinny rails and adapters for standard mounts. Quick-release Picatinny mount retains zero for AR platforms.
Specifications
- Manufacturer:
- Meprolight
- Category:
- Red Dot / Holographic Sight
- UPC:
- 879015004347
- MPN:
- 626210
- Required Component:
- No
Sponsored
Cash for Arms
Sell your firearm for top dollar
Get an instant offer on your gun. Safe, legal, and hassle-free.
Get an OfferWhere to Buy
Have one to sell?
Price History
No Price History Available
Check back later for pricing trends
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertRelated Guides
Guide
Optic Mounting Solutions: Height Over Bore Explained
An analysis of AR-15 optic mounting heights, how height-over-bore affects zero offset and holdovers, and the tradeoffs between absolute co-witness, lower-third, and taller mounts.
6 min read
Guide
Optics 101: Red Dots, LPVOs, and Magnified Scopes
A high-level overview of the main optic categories, explaining tradeoffs between speed, versatility, and precision for AR-15 builds.
7 min read