Operator's Manual

2.5 Installation of Equipment

MOUNTING

The 558 is equipped with mounting hardware (see Figure 6)

to attach to a 1” (25.4mm) Weaver or MIL-STD-1913

Picatinny style rail. To achieve the best results and accuracy,

the HWS must be mounted properly. The rail needs to be as

parallel as possible to the bore to permit the maximum eleva-

tion and windage adjustments. If it is required, it is strongly

recommend that the rail be installed by a qualified gunsmith.

To mount the sight, please follow these steps.

1. First, push the locking button inward, then turn the quick detach lever so it is away from its

closed and nested position in the base of the sight. The locking button must be pushed down

before pulling on the lever. This will expand the clamping interface to allow the sight to mount

onto the rail.

2. The sight contains a small cross bolt that rests in the groove of the Picatinny rail. Move the

sight to the position desired on the rail and allow the post to rest fully in the closest groove.

3. Push the sight as far forward as possible and close the quick detach lever so it is fully shut

and nested in the base of the sight.

4. 4. If at first the sight does not appear to be secure or the lever does not fully close, open the

quick detach lever. Next, turn the adjustment nut opposite the quick detach lever clockwise for

a tighter fit, and counterclockwise to accommodate wider rail tolerances until a proper fit is

achieved. CAUTION: Never make adjustments while the quick detach lever is in the

closed position.

Figure 6

Locking Button

Quick Detach Lever

Cross bolt for

Rail Slot

Adjustment Nut