This replacement or spare magazine is compatible with your rock island m1600.

Caliber: 22 LR
Capacity: 10rd
Finish: Blued
Model: OEM
Material: Metal with Polymer Floor Plate
Type: Detachable
Model Fit: M1600
Brand Fit: Rock Island
Capacity: 10

Magazine Restrictions:

The following states have magazine restrictions. Your order will not ship to those states if in violation of these laws and will be subject to cancellation and a 15% restocking fee.

California - Limited to 10-round capacity.
Connecticut - Limited to 10-round capacity.
Colorado - Limited to a 15-round capacity.
Delaware - Limited to 17-round capacity.
Hawaii - Handguns limited to 10-round capacity
Illinois (Cook Co, Aurora, Highland Park) - Pistol mags are limited to 10 rounds.
Massachusetts - Limited to 10-round capacity.
Maryland - Limited to 10-round capacity.
New Jersey - Limited to 10-round capacity.
New York - Limited to 10-round capacity.
Road Island - Limited to 10-round capacity.
Vermont - Handguns limited to 15-round capacity, Rifles limited to 10-round capacity.
Washington DC - Limited to 10-round capacity.
Washington - Limited to 10-round capacity.