Out of stock
SIG TAPER-CAP-556 TAPER CAP 556BBL 1/2-28 THRD
$22.73
The SIG TAPER-CAP-556 is a taper cap designed for .556 caliber barrels with 1/2-28 threading. If you're running an AR platform rifle—whether it's a SIG M400, MCX, or any other .556 setup with matching threads—this cap provides a clean, finished look at the muzzle when you're not running a suppressor, muzzle brake, or flash hider. It's a straightforward accessory that protects your barrel threads and keeps dust and debris out of the equation.
The taper design matches the profile of modern tactical rifle muzzles, so it sits flush without looking like an afterthought. Whether you swap suppressors regularly, alternate between different muzzle devices, or simply want to protect your threads when running naked, a quality taper cap is one of those small details that rounds out a professional setup. SIG's version is built to their standard—no frills, solid construction.
This is the kind of item you might not think about until you need it: you're taking a suppressor off for a range session, or you've got a backup upper that needs a cap while you work on your primary. Having the right thread pitch and taper profile matters, and this one is cut for the common 1/2-28 standard used across most .556 rifles.
Specifications
| Brand | Sig Sauer |
| Caliber | .556 |
| Thread Pitch | 1/2-28 |
| Type | Taper Cap |
| Finish | Black |
Frequently Asked Questions
Will this taper cap fit my AR-15 with 1/2-28 threads?
Yes, as long as your barrel is threaded 1/2-28, this cap will screw on. This is the standard thread pitch for most modern .556 AR platforms, including SIG M400 and MCX rifles, but always verify your barrel's thread specification before ordering.
Can I use this cap with a .223 barrel?
This cap is designed for .556 barrels with 1/2-28 threading. If your .223 barrel has the same thread pitch, it will physically fit, but confirm your barrel specs first.
What's the purpose of a taper cap?
A taper cap protects your barrel threads when you're not running a suppressor, muzzle brake, or other threaded accessory. It keeps dirt, moisture, and debris out of the threads and gives your rifle a finished appearance at the muzzle.
