$110.00
Otter Creek Labs OCM5 Gordon Collar
- Price Negotiable?: Yes
- Phone Number: Click to view
- Condition: New
- Listing Type: Individual
- City: Lehi
- State: Utah
- Zip/Postal Code: 84043
- Local County (e.g., Summit County): Utah
- Make/Brand: Otter Creek Labs
- Model: Gordon Collar Assembly
- Caliber: 5.56mm
- Terms: Must agree to terms
- Listed: August 29, 2026 12:32 pm
- Expires: 59 days, 16 hours

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Description
I have three Otter Creek Labs Gordon Collar Assembly. These are designed to fit 12.5″ FSP/FSB rifles to mount an OCM5, AEM5, or Ops Inc 12th Model suppressors for a ‘Gordon Carbine’ Build. Will also fit 14.5″ rifles with Midlength gas system.
These are limited production runs from OCL. These are all brand new, never mounted, never fired, and come with all three collars in the three sizes. Full description here:
“With the kit you will get 1 outer clamp, 3 inserts and 2 screws. The 3 inserts are made to different tolerances to fit more barrels and are marked accordingly as follows: 2 dots fits .735-.737 barrels, 1 dot fits .732-.734 barrels, No dot fits .729-.731 barrels. This gives you a total fitment range of .729-.737 barrels.
The outer clamp is made from 7075 aluminum with a type 3 hard coat anodize and the inserts are made from H900 heat treated 17-4 stainless steel and black nitride coated.
These are made to be used with 12.5” GOVT profile barrels with a FSP/FSB in conjunction with your OPS 12, AEM5 or OCM5. Your barrel must measure between .729 and .737 where the collar sits in order to have proper alignment and/or retention.
With the Gordon collar if you’re using a muzzle brake do not use a crush washer, use a shim kit instead. If you’re using the otter creek flash hider just thread it down to the shoulder with no shims or crush washer.
Traditionally Gordon collars have been made for 12.7 inch barrels. Who makes a 12.7 inch barrel? Good question. Your only option was to have a custom barrel made or get a longer barrel and have a gunsmith chop it to 12.7 inches. So we just skipped all that jazz and shortened the whole assembly by .2 and boom, a Gordon collar for 12.5” GOVT profile off the shelf barrels. These will also fit 14.5 barrels with a midlengh gas system and FSP/FSB as long as they fit the OD requirements/gov profile.”
$110/ea, I’ll sell all three for $285 and would cover shipping.
$200 retail normally when in stock. Similar AE 3pc Collar with 3 inserts is $180.
Individual piece purchase buyer would cover shipping. Willing to meet up between Lehi & Orem MWF, and will ship anywhere in the country. Cash heavily preferred, can also do Venmo. No CashApp or PayPal or other payment methods accepted.
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