Features:

• 6061 Aluminum 
• Type 3 Hard coat Anodized
• Strip Stripe Ledge for easy extraction 
• Tapered edge to fit frames with magwell
• Uses factory Spring
• USPSA CO Legal
• Made in America

Fit:

• Only fits Sig 17 round mags
• Sig Sauer xMacro frame with or without Tac Ops magwell, or their EMP-XM magwell flare
• Mischief Machine xMacro frame 
• Icarus Precision xMacro Frames, ACE Xmacro 
• ShaloTek Flex, XR-17, XLR-17, XXLR-17
• Fits all smaller frames but will leave a gap

Please NOTE: A small percentage of Sig Sauer 17 round mags will not function with this +4 basepad. They are seeing about 2% of the 17 Round mags coming from SIG with springs that are too short. Please measure your spring as referenced in the product pics. If your spring does not extend at least 1-1/4" past the magazine body when base is removed do not use that mag for the Plus 4 base pad. While they are unable to reproduce these issues in house they are working to better understand this but can only assume at this time that some Sig 17 round mags have springs that are too short.