Yes, the muzzle device is pinned and welded. That can be seen on Geissele's website and in our Product Info.
Copied and pasted directly from the description. NFA DISCLAIMER/WARNING: This item contains a permanently pinned and welded muzzle device. This makes the muzzle device an integral part of the barrel to make the barrel meet the 16" minimum length requirement, and requires no registration or tax stamp from the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE). Removal or modification to the muzzle device, will result in converting this item to a regulated item by the National Firearms Act (NFA). Additional state and local restrictions may apply. It is the sole responsibility of the buyer to comply with any and all applicable laws.
it is pinned and welded - 14.5" barrel with flash hider bring it over 16" limit