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SIG Model/Barrel size chart

Updated 1/18/25:

This page is a resource for those that want to understand the barrel sizes for the SIG P320 and P365 platforms. The chart also covers the correct threaded barrel lengths for each platform. Note that these measurements are not exact and are for the use of clarifying compatible parts for your model.

 

Model Standard barrel length (in) Threaded barrel length (in)
P320 sub-compact/xcompact 3.6 4.3
P320 compact/carry 3.9 4.6
P320 full size (not XFive or XTen) 4.7 5.5
P365/365X Standard 3.1 3.75
P365 Xmacro Comp/N365DG 3.1 N/A (Incompatible)
P365XL/Xmacro 3.7 4.35

 

Other notes:

- The XMacro comp cannot run a threaded barrel. The barrel stops short of the integrated comp and is not designed to accommodate additional barrel length or pass-through. 

- P320 sub-compact barrels are long enough to clear the length of a compact size slide. However, the parts are not designed to be used that way and most attachments will not have sufficient length to use that combination. Some manufacturers may use that setup so consult their instructions if they directly design for that combination.