ATEi

ATEi does one thing and does it extensively: mill pistol slides to accept direct-mounted mini red dot sights. They're not a gun store. They don't sell pistols. They take your slide—or your whole gun—and machine it to run a combat optic the right way.

Pro Cut ($160) - Precision pocket milled to exact optic dimensions - Zero gap between pocket and optic sight - Requires you to send the optic for custom machining - Recommended for duty, defensive, or home defense applications - Available for both standard (RMR-sized) and micro optics (RMRcc, 407K, 507K, EPS, EPS Carry)

Universal Cut ($130) - One pocket fits multiple RMR-footprint optics - Compatible with: Trijicon RMR/SRO, Holosun 407C/507C/508T, Ameriglo Haven - No optic needed to order—ATEi mills it without seeing your sight - Expect gaps in the pocket that could shift under hard impact - Not recommended for duty use

Full-size & compact slides (RMR footprint or larger optics): - Glock 17/19/23/26/34/41/45 and Glock 17L/24 - S&W M&P 9mm/.40/.45/10mm (3.6", 4", 4.25", 5" and Compact variants) - Sig P226 Legion, P229, P320, P320 Full Size - HK VP9, VP9 SK, VP9L-B, USP 40 - FN, CZ P-07/P-09/P-10/P-10C - 1911/2011 slides (direct mount or via Trijicon 1911 RMR Mount)

Micro optic slides (smaller footprint guns): - Glock 42/43/43X/48 - S&W Shield, Shield Plus (NOT .380 EZ) - Sig P365 - Springfield Hellcat, EMP - CZ 75 SP-01, Shadow 2

Clamp-mounted optic slides (ACRO, 509T, Steiner MPS): - Glock 17/19/23/26/34/41/45 - S&W M&P (requires laser-welded pad) - HK VP9/VP9 SK/VP9L-B - CZ P-07/P-09/P-10/P-10C

What ATEi won't mill: Holosun SCS (designed for factory optic-ready slides only), Archon Type B, Springfield XD series, HK USP9, HK P30, most Sig two-piece slides. Some slides like the Steyr L9-A2 MF have internal geometry that blocks optic mounting entirely.

Some slides have internal voids or geometry issues that prevent direct optic mounting. ATEi solves this by laser-welding metal plugs or pads:

• •Glock 17L, 24, 41 - Rear void requires plugged screw hole
• •Sig P320 Full Size - Void needs laser-welded plug
• •S&W M&P + ACRO - Factory dovetail conflicts with clamp mechanism, needs welded pad
• •Beretta APX - Void at rear of slide

Laser welding adds cost and extends turnaround time (slides ship out for external welding). Without it, some optics simply won't mount safely.

ATEi uses 6-40 flathead screws (stronger than manufacturer 6-32 screws) for most optic installs. This allows more thread engagement and generally eliminates the need for Loctite.

• •Exception: Micro optics (RMRcc, 407K/507K, EPS, EPS Carry) use manufacturer screws as-is. You get the Trijicon seal plate and don't receive extras.

Every slide comes with an instruction card showing how to remove screws without stripping, plus the correct allen wrench.

You can't use factory-height rear sights with an optic mounted. ATEi offers Ameriglo tall sights positioned for lower 1/3 to 1/4 co-witness:

• •Sight sits low enough to be mostly hidden behind the optic window
• •Visible if your dot fails
• •Works as true backup irons, not "co-witness" in the traditional sense

• •Special case: Deltapoint Pro optics run roughly 1/4" taller, requiring even taller suppressor-height sights for co-witness.

Some platforms can keep their factory rear dovetail with optics mounted. Others require milling a new dovetail in front of the optic:

Can use factory dovetail (RMR footprint): - Glock 17/19/23/26/34/41/45 - Sig P226 Legion, P229, P320 - HK VP9/VP9 SK/VP9L-B, USP 40

Cannot use factory dovetail (rear sight in front of optic required): - Glock 42/43/43X/48 - S&W Shield/Shield Plus - Vortex Venom/Viper (too long) - Deltapoint Pro (too long) - Aimpoint ACRO

• •ATEi ShimSight Alternative: Doug designed this sight to mount in front OR behind certain optics (ACRO, others). Works on slides where dovetail clearance is tight.

ATEi mills 1911 and 2011 slides using the Trijicon 1911 RMR Mount, which includes integrated rear night sight and front night sight. Accepts any RMR-footprint optic: - Trijicon RMR/SRO - Ameriglo Haven - Holosun 407C/507C/508T

For direct micro optic mounting on 1911s (RMRcc or K-footprint only), you'll lose front sight usability due to optic height. ATEi recommends the Trijicon mount for backup sights instead.

ATEi offers screw removal for stripped or broken fasteners. Cost depends on difficulty and time required.

ATEi stocks some optics and can special-order others depending on availability. Not every optic model stays in stock.

• •Milling slides that are two-piece construction
• •Removing or disabling factory safety features
• •Milling slides with raised loaded chamber indicators
• •Custom cuts for optics not listed above (unless you call first)

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• •Note: Customer is responsible for return shipping. ATEi quotes work and turnaround before machining begins. Photos of slide internals accepted if your model isn't listed—or send the slide and optic for in-person evaluation.