Remington Model 58 / 878

The illustrations shown below was scanned off a Remington factory parts list, and are factory part numbers. This is important as about all obsolete parts suppliers use ONLY factory or closely associated numbers where ever possible so everyone is on the same page. This model could use 3 different model numbers, 58, SPT 58, or Sportsman 58, all the same gun, the Sportsman designation was one of Remington's method of designating the firearm could only hold 2 rounds in the chamber, (therefore complying with the Federal Migratory Bird laws) as compared to a magazine capacity of more, requiring a "plug".

The Above illustration & parts listing below was taken from 1979 Remington factory repair/parts manual

ID #	Part Number	Nomenclature	ID #	Part Number	Nomenclature
1	25865	Action Bar Assembly	31	17436	Firing Pin
.	19355	Action Bar Stud	32	18623	Firing Pin Retainer Pin
2	19365	Action Spring	33	17437	Firing Pin Retractor spring
3	16405	Action Spring Stop	34	25175	Fore-end 12 Ga.
4	17015	Barrel Assembly Plain, 12 Ga, (30")	.	23047	Fore-end 16-20 Ga.
.	21691	Barrel Assembly Plain, 16 Ga, (28")	35	24256	Fore-end Ring
.	21696	Barrel Assembly Plain, 20 Ga, (26")	36	19363	Fore-end Ring Washer
.	26215	Barrel Assembly Plain, 12 Ga. Magnum (30")	37	18673	Front Sight
.	16358	Bolt Return Plunger	.	16159	Grip Cap
.	17676	Bolt Return Plunger Cross Pin	.	25385	Grip Cap Screw
.	16360	Bolt Return Slide Plunger Spring	38	18749	Hammer
5	16967	Breech Bolt 12 Ga.	39	16600	Hammer Pin
.	16400	Breech Bolt 20 Ga.	40	17465	Hammer Plunger
.	25170	Breech Bolt Assembly 12 Ga.	41	19014	Hammer Spring
.	23577	Breech Bolt Assembly 20 Ga.	42	22325	Locking Block Assembly
.	16889	Buffer	.	24075	Locking Block Assembly (oversize)
6	20616	Butt Plate	43	22895	Magazine Cap Assembly, 12 Ga.
7	25410	Butt Plate Screw	.	23680	Magazine Cap Assembly, 16 Ga.
8	15628	Carrier 12-16-20 Ga	.	23681	Magazine Cap Assembly, 20 Ga.
.	26875	Carrier Assembly 12-16-20 Ga	44	22075	Magazine Follower
9	15480	Carrier Dog	45	16750	Magazine Spring
10	17416	Carrier Dog Follower	47	17229	Operating Handle
11	16966	Carrier Dog Follower Spring	48	15097	Operating Handle Plunger
12	18781	Carrier Dog Pin	49	15098	Operating Handle Plunger Retainer
13	18760	Carrier Dog Washer	50	16791	Operating Handle Spring
14	16348	Carrier Latch	.	22080	Piston Assembly
15	15703	Carrier Latch Follower	52	16029	Piston Ring
16	16345	Carrier Latch Pin	54	18551	Receiver Stud
17	16344	Carrier Latch Spring	55	25115	Safety
18	17417	Carrier Pivot Tube	56	23223	Safety Detent Ball
19	16347	Carrier Release	57	17514	Safety Spring
20	16983	Carrier Release Pin	58	17515	Safety Retaining Pin
21	16327	Carrier Release Spring	59	18750	Sear
24	17420	Connector Pin	60	17463	Sear Pin
25	16712	Disconnector	61	17518	Sear Spring
26	25431	Ejector, 12Ga.	62	16909	Shell Latch, Left, 12 Ga.
.	24446	Ejector, 16Ga.	.	20041	Shell Latch, Left, 16 Ga.
.	24447	Ejector, 20Ga.	.	20042	Shell Latch, Left, 20 Ga.
27	18647	Ejector Rivet	63	23080	Shell Latch, Right, 12 Ga.
28	16176	Extractor	.	20046	Shell Latch, Right, 16 Ga.
29	17432	Extractor Plunger	.	20047	Shell Latch, Right, 20 Ga.
30	17433	Extractor Spring	64	20050	Stock Assembly
.	.	.	.	20610	Trigger Assembly
43	22897	Magazine Cap Assembly, Magnum	.	.	.
.	.	.	.	.	.

This model apparently was a short lived try to come up with a self adjustment gas system (as compared to the model 58 which the shooter had to do the adjustment on the magazine cap)

The Above illustration & parts listing below was taken from 1979 Remington factory repair/parts manual

Remington Model 878
Made in 12 ga. ONLY
It was introduced in 1959, & discontinued in 1962

NOTE - part numbers in BLUE are the same as the Model 58
Any item not shown on this listing was OBSOLETE at the time of printing

ID #	Part Number	Nomenclature	ID #	Part Number	Nomenclature
1	25860	Action Bar Assembly	25	19363	Fore-end Ring Washer
2	19365	Action Spring	26	18673	Front Sight, (plain barrel)
2a	19659	Action Spring Stop	30	18749	Hammer
3	.	Barrel Assembly Plain, 12 Ga, (30")	31	16600	Hammer Pin
4	16967	Breech Bolt 12 Ga.	32	17465	Hammer Plunger
.	25170	Breech Bolt Assembly 12 Ga.	33	19014	Hammer Spring
4a	20616	Butt Plate	34	22325	Locking Block Assembly
4b	25410	Butt Plate Screw	35	19014	Locking Block Stud
7	15480	Carrier Dog	36	16895	Magazine Cap Assembly
8	16905	Carrier Dog Follower	.	17451	Magazine Cap Detent
9	17415	Carrier Dog Follower Spring	.	16791	Magazine Cap Detent Spring
10	18781	Carrier Dog Pin	37	16896	Magazine Follower
11	18760	Carrier Dog Washer	38	16750	Magazine Spring
12	17417	Carrier Pivot Tube	39	25390	Operating Handle
13	17419	Connector, Left (Restricted)	40	15097	Operating Handle Plunger
14	17551	Connector, Right (Restricted)	41	15098	Operating Handle Plunger Retainer
15	17420	Connector Pin	42	16791	Operating Handle Spring
16	16712	Disconnector	43	25165	Piston Assembly
.	25431	Ejector	45	18551	Receiver Stud
.	18647	Ejector Rivet	48	25115	Safety
17	16176	Extractor	49	23223	Safety Detent Ball
18	17432	Extractor Plunger	50	17514	Safety Spring
19	17433	Extractor Spring	51	17515	Safety Retaining Pin
20	17436	Firing Pin	52	18750	Sear
21	18623	Firing Pin Retainer Pin	53	17463	Sear Pin
22	17437	Firing Pin Retractor spring	54	17518	Sear Spring
23	25175	Fore-end	55	16909	Shell Latch, Left
24	24256	Fore-end Ring	56	23080	Shell Latch, Right
.	.	.	.	22990	Stock Assembly w/pad
.	.	.	.	20610	Trigger Assembly
.	.	.	.	.	.