This Remington manufactured second variation slide with operating handle plunger & spring is for the model 11-48 semi-auto shotgun in 16 and 20 gauge and having the second variation breech bolt without the feet. The overall condition is very good with light wear. (file photo)

Note: Remington model 11-48 semi-auto shotguns with the following gauge and serial numbers have been observed with this part:

16 Gauge: 5522646, 5529558, 5550951 & 5564860

20 Gauge: