Here's some great LC infro thanks to our own JDW
From a 1928 Ideal Grade
1. Top Trigger Plate Screw: 10-32 thrds OAL. 1.485 Head Dia. .300 Thickness .118 Body Dia. .200
Slot. .036
2. Trigger Plate to Tang: 8-32 thrds OAL. 1 .375 Head Dia .222 Thickness .070 Slot. .031
3. Lock Plate Connecting Screw: 8-32 thrds. OAL. 1.375 Head Dia. .218 Thickness .060
Slot .031
4. Trigger Plate Screw-Front: 10-32 thrds. OAL. .280 Head. Dia. .300 Thickness .070 Slot .032
3. Lock Plate Retaining Screw (2 on FW) 8-32 thrds. OAL. .235 Head Dia. .218 Thickness .060
Slot. 032
5. Top Lever Screw: 4-40 thrds. OAL. .310 Head Dia. 238 Thickness .065 Slot .032
6. Forend Screws-Rear (2) 10-32 thrds. Shank Dia. .122 Shank Length .160 OAL .340 Head Dia. .203
Slot .028
(For later model Smith’s, earlier models had longer shank.)
7. Roller Release Machinist Oval head Screw 8-32 thrds. OAL. .715 Slot .036
8. Forend Oval Head Wood Screw (2 required on Field Grade) #8x ½” long.
9. Trigger Guard Oval Head Wood Screw: #8x ¾” long Slot .036
10. Firing pin
In "Plans and Specifications of the L.C. Smith Shotgun" 5060 tool steel was used for pre-1913 firing pins. Post-1913 guns had chrome vanadium steel.
Not pictured: Buttplate Oval Head Wood Screw: (2) #12x1 3/16” long Slot .046
