Product Overview
QTR-LT™ Stop - A narrower variant of our popular QTR Stop, the QTR-LT Stop was specifically designed for the MCX-Rattler LT rail for a foreign defense contract. Designed as a lightweight solution to prevent shooters from slipping a hand in front of the muzzle, and filling the side gaps up to the rail to prevent heat exposure from muzzle blasts. The QTR-LT Stop works as intended on any Sig MCX-SPEAR LT/Rattler LT rails, as well as many other M-LOK forend rails (see compatibility list below). Its upward ears were designed to flow and mate specifically with the Sig LT-rail profile to create a wide and seamless barrier. Made out of 7075 Aluminum and hard anodized in Carbon Black or Terra Bronze, and weighing in at just under half an ounce. The QTR-LT Stop takes up only 1/2 M-LOK slot at the end of the rail by utilizing a mini M-LOK recoil lug that hangs over the front lip of the rail. The QTR-LT Stop creates a perfect indexing point to bring the rifle on target securely and consistently. Mounts to 0.625" wide M-LOK flat or narrower.
Ships Free and Made in USA
- Mount Type: M-LOK
- Footprint: 1/2-Slot
- Height: 0.850"(from rail) 1.108" (overall)
- Length: 1.050"
- Width: 1.450"
- Weight: 0.56oz w/ hardware
- Material: 7075-T6 Aluminum
- Finish: Type 03 Hardcoat Anodizing
- Color: Carbon Black®, Terra Bronze® (see anodizing disclaimer on our FAQ page, line 14 here)
- Hardware: US Made 416 Stainless M-LOK Nut
- Fastener: US Made T20 Torx Fastener w/ Nylon Thread Patch
Fitment & Compatibility List:
- BCM MCMR M-LOK Rail - Regular Slot: Yes, Forward Slot: Yes
- Dakota Tactical MHS-5/5K M-LOK Rails - Regular Slot: Yes, Forward Slot: No
- Daniel Defense MFR M-LOK (Not XL) - Regular Slot: Yes, Foward Slot: Yes
- Geissele MK16 Rail - Regular Slot: Yes, Forward Lip: Yes
- Sig Sauer MCX-Rattler LT Rail - Regular Slot: Yes, Forward Lip: Yes (May hang off if stacked)
- Sig Sauer MCX-SPEAR LT Rail - Regular Slot: Yes, Forward Lip: Yes (May hang off if stacked)
- Sig Sauer MCX-SURG Low-Profile Rail - Regular Slot: Yes, Forward Lip: Yes (May hang off if stacked)
- Sig Sauer MCX Virtus SD Rail - Regular Slot: Yes, Forward Lip: Yes
Does Not Fit:
- Daniel Defense RIS 3 Rail
- KAC URX4 M-LOK Rail
- LMT MRP M-LOK Upper/Rail
- Noveske NSR Gen 3 M-LOK
- Sig Sauer M400/M400 SDI X M-LOK Rail
- Sig Sauer MCX Rattler U-Rail (Gen 1 5.5")
- Sig Sauer MCX-SPEAR (7.62x51/308/6.5/6.8)
- Sig Sauer MCX-SPEAR LT SD Rail - Use regular QTR Stop for LT SD rail
- Sig Sauer MCX-SURG SD Rail (Wide Rail)
- Sig Sauer MCX Virtus U-Rail Rail
- Sig Sauer MPX/MPX-K M-LOK Rail
If you don't see your rail listed or have questions, email fitment@railscales.us
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For all patents and trademarks, see www.railscalesip.com
