Knight's Armament
Knight's Armament (KAC) built its reputation on military-contract rail systems and precision rifles, and that same engineering standard carries through to their suppressor kits. Impact Guns carries KAC's 5.56 and 7.62 suppressor lineup across their quick-detach mounting systems, in both Black and Flat Dark Earth finishes.
Read our full Knight's Armament Buying Guide ↓
QD Mounting Systems: QDC, CRS, NTR, and MCQ
KAC's suppressor kits ship as a complete system — the can plus a specific quick-detach mount (QDC, CRS, NTR, or MCQ) and the muzzle device it attaches to (PRG, PRT, or QDSS). These aren't interchangeable parts you mix and match freely; each kit is sold as a matched set, so the mount and muzzle device names in a listing tell you exactly what attachment system you're buying into. If you already run one KAC mounting system, staying within that same family lets you swap suppressors across rifles without changing muzzle devices.
5.56x45mm Suppressors
The 5.56 lineup includes the compact MCQ (4.43"), the QDC/CRS-PRT (6.25"), and the longer NTR/QDSS-PRG (6.75") — shorter cans trade some sound suppression for a lighter, more maneuverable rifle, while the longer options prioritize suppression at the cost of added length and weight forward of the receiver.
7.62 Suppressors
The 7.62 lineup covers the CRS/DSR-PRG (5.75") and the longer QDC/CRS-PRG (7.9"), both built to handle the higher pressure and larger bore of .308/7.62 NATO rifles. As with the 5.56 line, the shorter option favors handling and the longer option favors maximum suppression.
Frequently Asked Questions
Do I need a tax stamp for a Knight's Armament suppressor?
As of January 1, 2026, suppressor purchases require only a standard background check, not an NFA tax stamp — but confirm current requirements before purchase since regulations can change.
Can I use a KAC suppressor on a rifle that isn't KAC-made?
Yes, as long as your rifle's barrel is threaded to match the specific KAC muzzle device the kit includes (typically 5/8x24 for 7.62 or 1/2x28 for 5.56) — the suppressor and mounting system aren't tied to any specific rifle brand.
See Also: Suppressors • HUXWRX • Liberty Precision Machine