This shim set is NOT required for Chinese, Russian, Polish or Bulgarian AK barrels in either 5.56 (.223) or 5.45 mm calibers, as they already have the requisite .678" to .710" barrel diameter at the clamping position. The Romanian small bore barrels need the shims to bring their outside diameter of approximately .600" at the clamping position, up to the standard diameter of approximately .700". Romanian AKs in 7.62 x 39 do NOT need the shims.

• Aluminum shim set
• For mounting the UltiMAK M1-B to Romanian 5.56 mm (.223) or 5.45 mm caliber AK rifles such as the SAR-2 and SAR-3 or WASR-2 and 3, etc
• Made in USA

Aluminum shim setUltiMAK