sight rail

sight rail

One of a series of horizontal rails, usually boards supported at both ends, which are used to check the gradient of a pipe in a trench; the rails are adjusted by sighting a line having the desired gradient; the rails then establish a line from which the bottom of the trench can be measured.
References in periodicals archive ?
You likely have customers who don't think they need a light or light/laser unit to go on the integral sight rail of their pistols.
A 6-inch scope sight rail is affixed to the receiver with four slotted 6-48 screws.
ACTION TYPE: Pump, GAUGE: 12, BARREL: 1-1/2", chrome lined, 3" chamber, CHOKE: Ported cylinder tube, CAPACITY: 5+1 [2-3/4"'' shells], 4+1 [3"], WEIGHT: 7 pounds, OVERALL LENGTH: 39", STOCK: Synthetic, FOREARM: Synthetic, with rail, SIGHT BASE: Picatinny sight rail, SIGHTS: LPA adjustable ghost ring rear, fiber-optic front, RETAIL: $417
It is the first sight rail passengers from the south see when they come into Newcastle Gateshead.
No excessive force is required, but you do have to pay attention that the pistol enters the sleeve low enough for the keyway on the sleeve to align with the sight rail on the bottom of the pistol frame.
An integral Picatinny-style sight rail runs from the back of the receiver to the front of the handguard.
The PAS-12 can be had with an adjustable rear sight, but the RG-RIC model comes with an installed sight rail.
The 2T is supplied with a high-quality ARMS rear sight, easily attached to or removed from the sight rail and adjustable for windage.
However there is a neat rear sight which folds down into a recess in the sight rail.
Key features include 24" hand-lapped stainless steel select match grade barrel, plain target crown muzzle with optional muzzlebrakes, A2-style fixed stock, free-floating Picatinny handguard, ergonomic custom grip, AR-15-style accurized flattop receiver, 20-round magazine and custom "Extreme Environment" corrosion-resistant finish on the receiver, bolt, barrel and sight rail.
380 and a Hammerli match pistol, the 87 appeared to be a Cheetah frame with the trigger squared a little in front, and a barrel/slide assembly that was in essence the one from the Gold Standard, but trimmed down a bit from the top and with a Weaver-style scope rail that also acted as a low-profile (iron) sight rail.
The SL8-1 appears to be cross between a Scout rifle and an AR-15, with extensive polymer construction, a 10-round removable magazine, a Picatinny sight rail and an adjustable cheek piece.