This is an OEM Sig Sauer M400 TREAD (AR15) Barrel Nut. This is required if you are putting a TREAD handguard on an AR15. Your existing barrel nut will not work if you don't have a M400 TREAD rifle.
Internal Reference:
KIT-TRD-BBL-NUT
Barcode:
798681613403
| Brand: Sig Sauer |
| Model: AR-15, M400, SIG M400 SDI |
| Part Type: Barrel Nuts |
| Color: Black |
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