Rock Island Armory 9mm or .38 Super 1911 A2 and Armscor 1911 A2 FS PS 9mm 17 round magazine with the blued finish, Mec-Gar Para Ordnance P18 17 RD magazine MGP183817B. These are double stack magazines, they don't fit single stack 1911's.
Please note these magazines don't have the polymer extended base that comes on the magazines used in the Rock Island Armory 1911 A2 with the magwell. The magwell may interfere with the insertion of these magazines. The Springer Precision base pad or OEM factory base pad 54152 will solve that problem.
The Rock Island Armory .22 TCM originally came with the Mec-Gar P18 magazines but there were modifications made to the feed lips to increase reliability with the .22 TCM. These magazines don't have the modified feed lips. While some have used these magazines with the .22 TCM with no issues most have feeding problems. The magazines were made for the 9mm and .38 Super and there is no need for modified feed lips when used with either the 9mm or .38 Super. If used with the .22 TCM there will likely be feeding problems. Don't expect the magazines to be 100% with the .22 TCM.
Note these Para P18 magazines aren't compatible with the Para P18.9 or models with the magwell. The Para Pro Custom 9mm with the magwell takes a different longer magazine.
Caliber 9 mm, .38 SUPER
Capacity 17 Standard
Carbon Steel Tube, heat-treated for strength
Higher tensile music wire spring
Removable steel butt-plate
NOT COMPATIBLE WITH PARA PRO CUSTOM P18.9 PISTOL OR AFTERMARKET POLYMER BASEPADS
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Springer Precision Rock Island Armory 9mm EZ +.25 base pad (BLK)
Constructed from certified carbon steel and features a heat treated housing and high-impact polymer or certified carbon steel follower and floorplate. The magazine spring is made of high strength type "D" music wire-the strongest wire available. TIG welding provides additional strength and a seamless finish. Each magazine surface is specially treated to ensure high corrosion resistance.
Mec-Gar is proud to be the Original Equipment Manufacturer of magazines to most of the prominent firearm manufacturers for the last 40 years including AMT - Armscor - Astra - Beretta Bernadelli - FN Browning - BUL - Charles Daly - Colt - CZ - IMI - Kel-Tec - Kimber - Llama - North American Arms - Remington - Sigarms - Smith & Wesson - Springfield Armory - STI - Standard Arms - Star - Steyr - Tanfoglio - Taurus - Walther.