The.204 must be a fairly new gun so you have it easy. Some of the older stuff can be confusing. If you email Remington they will give you the exact info (usually). I have done this on all mine. The exact place on Remington.com can be hard to find, but keep at it, and write down the navigation when you find it. Remington 1100 For Sale Remington 1100. Clear (Remington Wikipedia Page) 19 Item(s) Found Page 1 1. High(Bid) Time(Left) 17122600. Remington 1100 USED GUN INV 235050 - 12 GA $524.00: 33 $524.00 5d 16h 37m 17121378. Remington Model 1100 Sporting with Extended Tube - 12 $900.00: 0 $900.00. Founded in 1816 by Eliphalet Remington. Company has distinction of being oldest firearms manufacturing firm in United States. Since 1856, it has been known by four different names: between 1856 and 1888, E. Remington & Sons; 1888-1910, Remington Arms Company; 1910-1925, Remington Arms U.M.C. Company (Union Metallic Cartridge Company); and 1925 to present, Remington Arms Company. Remington rubber butt pad rates the same like new. Hard to find shotgun in this condition. Thanks for looking and good luck. Any questions just ask. NO SALES TO ALASKA,CALIFORNIA,OR HAWAII. $40.00 SHIPPING TO YOUR FFL. Need any more photos just ask. SOLD Shotgun Gauge: 20 Gauge Manufacturer: REMINGTON Model: 1100 LT20 Serial Number: N154556U.
Description: First truly modern centerfire rifle with the strongest bolt ever developed. Offered in long action only.

Introduction Year: 1948
Year Discontinued: 1962
Total Production: Approximately: 173,124
Designer/Inventor: Merle 'Mike' Walker & Homer W. Young
Action Type: Bolt Action
Serial Number Blocks: Starting: 1,100 - Ending: 423,000
Caliber/Gauge:
.264 Win. – 1961 – 22' barrel
.270 Win. – 1948 – 24' & 22' barrel
.280 Rem. – 1960 – 22' barrel
.30-06 Sprg. - 1948 – 24' & 22' barrel
.300 H&H Mag – 1948 – 26' & 24' barrel
Variations:
721A 1948 – 1962
721AC 1949 – 1955 (checkered stock)
721B Special Grade 1949 – 1955
721D Peerless Grade 1949 – 1959
721F Premier Grade 1949 – 1959
721 ADL - 1955-1959
721 BDL - 1955-1959