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Questions & Answers
Customer Reviews
Helpful Positive Review
Solid steel by Greg V, Verified Owner, June 8, 2025
This tool is top quality,and very precise in it's tolerances.so glad I opted for this purchase. fast processing and shipping too from optics planet!
1/1 found this helpful
Helpful Positive Review
Stubborn nut by Knuckle buster, Verified Owner, January 10, 2026
I had a barrel nut that was stuck pretty good and this tool made it easy and safe
1/1 found this helpful
Helpful Positive Review
wish I had it sooner by Bobby, Verified Owner, June 7, 2026
Wish I had this before ruining my upper trying to get stock Ruger barrel nut off. Well the new receiver appreciated it. Was great for installing hand guard and site as well.
2/2 found this helpful
Helpful Positive Review
Otis Lock Block by DED, Verified Owner, May 22, 2024
Was having trouble installing my muzzle device and keep from twisting my Adams Arms piston gas block out of alignment. This lock block holds the barrel solid, not the upper receiver. You can really get your muzzle brake/flash hider super tight with...
Read More...
2/2 found this helpful
Most Recent Reviews
demo product by Gator, Verified Owner, January 18, 2026
This was a factory demo the tool was like brand new the package was damaged slightly. That made it a good deal
0/1 found this helpful
Most Recent Reviews
demo product by Gator, Verified Owner, January 18, 2026
This was a factory demo the tool was like brand new the package was damaged slightly. That made it a good deal
0/1 found this helpful
Read All 10 Reviews
Finish:
Manganese Phosphate
Gun Model:
AR-15
Gun Make:
AR Platform
Gun Type:
Rifle
Fabric/Material:
1018 Steel
Color:
Black
Condition:
New

Code: L7-RB0-OTIS-FG-ARLB-FG-ARLB

MPN: FG-ARLB

UPC: 014895012918

List: $104.19Save 15%
$88.56

Product Info for Otis Technology AR Lock Block

The Otis Technology Pro+ AR-15 Lock Block is designed to make the removal and installation of barrels and even hand guards quicker, while also allowing you to tackle stuck barrel nuts with ease. Held in a standard bench vise, the AR-15 Lock Block locks into the barrel extension, securing it from twisting and minimizing the chance of marring. Give it all the elbow grease your project needs, the AR Lock Block has you covered. The torque is applied to the barrel extension rather than aluminum upper for a stronger, more secure hold. To accommodate internal receiver differences present in the market, the AR-15 Lock Block is designed with a bronze bushing which allows the tool to work with slightly smaller internal specs. Designed for milspec receivers, the AR-15 Lock Block works on most ARs. Crafted from 1018 steel and finished in a manganese phosphate coating, itll stand up to the job and then some. To use, simply lock the tool into a standard bench vise at your designated working angle and slide your upper receiver and barrel onto the AR-15 Lock Block. The tool then engages its locking lugs into in the barrel extension to alleviate the tension on the receiver and placing it on the extension itself.image

WARNING: California`s Proposition 65

Specifications for Otis Technology AR Lock Block:

Manufacturer: Otis Technology
Finish: Manganese Phosphate
Gun Model: AR-15
Gun Make: AR Platform
Gun Type: Rifle
Fabric/Material: 1018 Steel
Color: Black
Condition: New

Features of Otis Technology AR Lock Block

  • Securely and easily work on AR-15 upper receivers
  • Alleviates tension on the receiver by engaging locking lugs
  • Designed for milspec AR receivers
  • Bronze bushing accommodates most ARs
  • Compatible with most standard table or bench vises
  • Made from 1018 steel with a manganese phosphate coating

Package Contents:

  • Otis Technology AR Lock Block

Otis Technology AR Lock Block Orderable Models

List of Orderable Models

  • Otis Technology AR Lock Block, Black/Brass, AR-15, FG-ARLB , MPN: FG-ARLB , UPC: 014895012918 , Code: L7-RB0-OTIS-FG-ARLB-FG-ARLB

Otis Technology AR Lock Block Unavailable & Discontinued Models

List of Unorderable Models

  • DEMO, Otis Technology AR Lock Block, Black/Brass, AR-15, FG-ARLB , MPN: FG-ARLB-DEMO , Code: L7-RB0-OTIS-FG-ARLB-FG-ARLB-DEMO-OB-A
  • DEMO, Otis Technology AR Lock Block, Black/Brass, AR-15, FG-ARLB , MPN: FG-ARLB-DEMO , Code: L7-RB0-OTIS-FG-ARLB-FG-ARLB-DEMO
  • USED, Otis Technology AR Lock Block, Black/Brass, AR-15, FG-ARLB , MPN: FG-ARLB-EDEMO , Code: L7-RB0-OTIS-FG-ARLB-FG-ARLB-EDEMO-RE-B
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Last updated 2026-09-26 UTC.