Mossberg 22 LR Front Sights
Front sight dove tails are 0.375" wide, screw mount front sights use a 8-40 UNEF screw size.
Ivory Bead Front Sight
Dovetails into barrel, all steel with ivory bead.
No. 1A Ramp Front Sight
Has dovetail that drives into barrel slot; ramped base screws to dovetail; has gold bead and removable hood.
Special thanks to G. Armstrong for the detailed photos.
S-101 Ramp Front Sight
Same as S-106 below, except uses a screw to attach to barrel directly, no dovetail.
To change the front sight inserts, push down on the front sight spring S209 and slide the front sight hood S215 forward until it clears the inserts. Lift up the insert desired and turn down all others. Replace hood.
S-106 Ramp Front Sight
Has dovetail that drives into barrel slot; ramped base screws to dovetail; sight has choice or 4 reticules, thin, thick, pin & ball, aperture; all reticules pivot on shaft running length of sight; sight has removable hood; stamped steel.
S-109 Front Sight
Screws into barrel with one 8-40 UNEF screw; stamped steel, single post.
S-121 Front Sight
Base is held in place by a shoulder on the gold bead front sight which screws into the barrel. The hood locks into the base with 4 small feet. Stamped steel construction.
S-122 Front Sight
Dovetails into barrel, slotted for sight hood, used on early US Property 44 training rifles.
S-133 Front Sight
Dovetails into barrel, gold bead, flat top Partridge blade.
S-138 Front Sight
Dovetails into barrel, pedestal configuration with gold bead.
S-320 Ramp Front Sight
Dovetail that drives into barrel slot, the ramped base screws into the dovetail. The sight has choice of 2 reticules, pin & ball or aperture. Both reticules pivot on a screw headed shaft that runs perpendicular to the rifle bore through the sight base. The sight has removable hood, milled and stamped steel construction.
To change the front sight insert, loosen the lock screw on the side of the front sight. If the bead is in position, push it toward the rear of the rifle and the aperture will come up. If the aperture is in position, push it toward the muzzle and the bead will come up. After selecting the desired insert hold it in place and tighten the lock screw.
Lyman 17a Globe front sight
First introduced in 1929 with 7 interchangeable inserts.