The KGM Technologies ISURG (Integrally Suppressed Upper Receiver Group) in 5.56 NATO (brand part no. ISURG-556-16-BLK) pins and welds a purpose-built suppressor with an integrated gas block to an 11.5-inch barrel, bringing the assembly to a 16.7-inch overall length. Because the suppressor is permanently affixed rather than removable, this configuration delivers short-barrel handling without triggering a separate SBR tax stamp on top of the suppressor’s own NFA paperwork. KGM tunes the gas system specifically around this integrated setup, targeting strong accuracy, repeatability, sound suppression, and flash reduction across a range of 5.56 ammunition. As a suppressor permanently built into the upper, this is a genuine Title II item under the National Firearms Act, not an ordinary accessory.

Key Specifications

• Chambered in 5.56 NATO.
• Barrel measures 11.5 inches, pinned and welded to an integrated suppressor for a 16.7-inch overall length.
• Cut with a 1:7 twist rate.
• Gas system is tuned specifically for this pinned-and-welded, integrally suppressed configuration.
• Delivers genuine sound suppression and flash reduction as a permanently integrated suppressor, not a detachable can.
• Provides short-barrel handling without a separate SBR tax stamp, since the suppressor is permanently affixed to the barrel.

Frequently Asked Questions

Is this an NFA item? Yes. As an integrally suppressed upper with a suppressor permanently affixed to the barrel, it is a Title II item requiring an approved ATF Form 4 and transfer through an NFA-licensed dealer.

Does this require a separate SBR tax stamp? No. Because the suppressor is pinned and welded to the barrel, the assembly does not require a separate SBR stamp beyond the suppressor’s own Form 4.

Does this include a lower receiver? No, this is an upper receiver group; a compatible AR-15 lower is required to complete the rifle.

Buy the KGM Technologies ISURG Integrally Suppressed Upper

This is a Title II item regulated under the National Firearms Act. Purchase requires an approved ATF Form 4, no federal transfer tax, and transfer through a licensed NFA (SOT/Class 3) dealer, with an extended federal approval wait before delivery. Order through KGM Technologies' Silencers & Suppressed Firearms lineup and our Lubbock, Texas team will walk you through the transfer process.