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Questions & Answers
Will it work with 300 blackout? Expert Answer

Yes, the L2D Combat Thread Protector Retainer Lo-Pro O-Rings will fit 1/2x28 and 5/8x24 threaded barrels and is compatible with 300 Blackout.

by Ethan, Gear Expert, July 27, 2022
Will they work on .45 cal. 578x28

Yes they will.

by L2D, Verified Owner, July 13, 2022
Customer Reviews
Helpful Positive Review Works perfect by Jon, Verified Owner, October 2, 2019
These hold on your thread protector and don’t melt. What else is there to say............................................................................................................................
1/1 found this helpful
Most Recent Reviews Rubbers L2D by Deulley, Verified Owner, March 30, 2025
They work great 1/2x28. Helps keeping your thread protector from backing off.
Most Recent Reviews Great O-Rings for the price by WillWork4Guns, Verified Owner, June 4, 2024
Great o-rings for the price. You can’t go wrong at $1.33 for each one.
Most Recent Reviews They fit but don't provide thread protection by Wilfredo Montijo, Verified Owner, July 6, 2022
These fit 9mm and .40 S&W threaded barrels for glock pistols. However, they provide no cushion for the thread protector. Simply racking the slide will loosen the thread protector. Not sure what these rings are intended to do.
0/2 found this helpful
Most Recent Reviews Threaded Barrel Orings by Farmer90, October 10, 2021
These are orings. I hope they hold up over time. I think they are high temp. I got them for a decent price to add to a barrel that came without and have a couple spares. Havnt put them through much abuse at this point.
Read All 5 Reviews
Finish: Black Additional Features: 3 pack

Code: 3HD-PTB-TORLPOR-LD-P-O-BBL

MPN: LD-P-O-BBL

UPC: 812390031294

List: $4.00Save 13%
$3.49

Product Info for L2D Combat Thread Protector Retainer Lo-Pro O-Rings, 3-Pack

Prevent your thread protector from backing out while shooting by adding our threaded barrel retainer O-Rings to your barrel setup.image

This is not your standard rubber O-Ring, these thin lo-profile O-Rings are made of Viton ( fluorocarbon elastomer ) and can withstand temperatures from -15 degress to 450 degrees fahrenheit. The material is also resistant to cleaning solvents, oils and other chemicals that will break down regular rubber O-rings. The retainer O-ring is not visbile when your thread protector is tightened into place and are perfectly sized to prevent movement.

3 O-Rings to a Pack.

Specifications for L2D Combat Thread Protector Retainer Lo-Pro O-Rings, 3-Pack:

Manufacturer: L2D Combat
Finish: Black
Additional Features: 3 pack

Package Contents:

  • L2D Combat Thread Protector Retainer Lo-Pro O-Rings, 3-Pack

L2D Combat Thread Protector Retainer Lo-Pro O-Rings, 3-Pack Orderable Models

List of Orderable Models

L2D Combat Thread Protector Retainer Lo-Pro O-Rings, 3-Pack, Black, LD-P-O-BBL , MPN: LD-P-O-BBL , UPC: 812390031294 , Code: 3HD-PTB-TORLPOR-LD-P-O-BBL
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