The A-CUT mounts the Aimpoint COA directly to the Echelon's billet-machined slide without adapter plates. A full-length dovetail runs the length of the optic cut, secured by a front hook that tucks under a slide protrusion and a rear wedge that locks everything in place. This wedge-locking design transfers lateral forces into the dovetail rather than loading the mounting screws, which is the primary failure point on traditional pistol optic mounts where screws back out under recoil over high round counts.

Aimpoint launched the A-CUT exclusively with Glock at SHOT Show 2025 on the G19 Gen5, G45, G47, G43X, and G48. After a one-year exclusivity window, Aimpoint opened the interface to over 30 manufacturers in 2026. Springfield Armory is among the first wave of adopters alongside CZ (P-10 C Ported COA) and Smith & Wesson. The ultra-low mount height enables co-witnessing with the factory iron sights, providing a backup sighting system without removing the optic.

The Echelon is Springfield Armory's modular, striker-fired 9mm built around a stainless steel Central Operating Group, a self-contained, serialized chassis that houses the entire operating system. This is the same modular concept as the SIG P320's Fire Control Unit: the serialized component transfers between different frame sizes and grip modules, so one chassis can run in a compact carry configuration or a full-size duty setup.

All COA models feature hammer-forged steel barrels with Melonite finish and 1:10 twist rates. Slides are billet machined (not cast) with Melonite finish. The captive recoil system and 1.2-inch grip width are consistent across the lineup. Each model ships with a double-zipper handgun case that accommodates the pistol with optic mounted.

Springfield offers the Echelon COA in three configurations that cover concealed carry through duty use. All share the same $1,119 MSRP and Aimpoint COA optic.

The 4.0C is the carry-oriented model. At 23.9 oz with the flush 15-round magazine, it is the lightest of the three and the shortest in grip height at 5.125 inches. The 18-round extended magazine adds grip length and three rounds for range use or home defense.

The 4.0FC is the Goldilocks option. It pairs the 4.0C's compact slide length with a full-size grip that accepts 17-round flush magazines. The compact dust cover keeps the same 7.25-inch overall length as the 4.0C, but the taller grip provides more purchase area and two extra rounds. This is the same concept as the Glock 19X or SIG P320 XCompact: short slide for concealment, full grip for shootability.

The 4.5F is the duty and nightstand gun. The longer 4.5-inch barrel adds sight radius and velocity, and the medium grip module provides the most hand contact area of the three. At 24.6 oz with a flush 17-round magazine, it competes directly with the Glock 17 Gen5 MOS and SIG P320 Full in the duty-size segment. The 20-round extended magazine turns it into a genuine high-capacity option for home defense or competition.

The Aimpoint COA is a closed-emitter micro red dot designed specifically for pistol slides. The enclosed optical channel protects the emitter and lens from rain, snow, dust, and debris, which is the primary advantage over open-emitter designs like the Trijicon RMR or Holosun 507C where contaminants can obstruct the dot. For a full comparison of pistol optics, see our best pistol red dot guide.

Springfield Armory has confirmed that A-CUT/COA variants of both the 1911 and 1911 DS (double-stack) platforms are in development. No pricing, specifications, or release dates have been announced. The 1911 DS in particular is notable because mounting a red dot on a double-stack 1911 frame typically requires custom slide milling. A factory A-CUT solution would eliminate that step and the associated tolerance stacking issues.