Sig Sauer · P365 family
Sig Sauer P365 FUSE Comp
The compensated FUSE — and, unlike the plain FUSE it shares a housing class with, an RMSc-pattern gun by default.
Specifications
ModelP365 FUSE Comp
Slide length4.3"
Barrel length3.7"
Integrated compensatorYes
Factory capacity21+1
Grip module familyfuse
Optic cutRMSc / SIG-LOC Compact
Which optic cut does it have?
The cut is set per SKU, not per model, so the suffix on the box matters. This is read from the same fitment data the guides below use.
Standard SKUsRMSc
SKUs ending in -SL or -RXSLSIG-LOC Compact
Fit guides
Every optic in these lists is verified against this model’s factory cut, with prices checked against retailer feeds.
Magazines that fit your P365 FUSE Comp
What the maker says fits this model, and how each magazine sits in the grip. A baseplate that extends below the grip adds no rounds: capacity is always shown on its own.
P365 9mm 17rd Magazine (All 9mm Models)Capacity 17 rounds
Flush fit — Factory flush magazine for the FUSE; the FUSE also ships with extended 21-round mags
Not available in: CA, CO, CT, DC, HI, IL, MA, MD, NJ, NY, RI, VT, WA
P365-AXG LEGION 9mm 17rd MagazineCapacity 17 rounds
Flush fit — LEGION alloy basepad; sits flush in the FUSE grip
Not available in: CA, CO, CT, DC, HI, IL, MA, MD, NJ, NY, RI, VT, WA
TTI SIG X-MACRO Completed Magazine w/ Versatile BasepadCapacity 20 rounds
Fits, extends below the grip — Factory 17-round body with TTI's +3 basepad; extends below the grip
Not available in: CA, CO, CT, DC, DE, HI, IL, MA, MD, NJ, NY, RI, VT, WA
P365 9mm 21rd MagazineCapacity 21 rounds
Fits, extends below the grip — The FUSE's factory extended mag; the baseplate meets the grip with no gap
Not available in: CA, CO, CT, DC, DE, HI, IL, MA, MD, NJ, NY, RI, VT, WA
Doesn’t fit the P365 FUSE Comp: P365 9mm 10rd Finger Extension Magazine, P365 9mm 10rd Flush Magazine, P365X/XL 9mm 10rd Flush Magazine, P365/X/XL 9mm 12rd Magazine, P365/X/XL 9mm 15rd Magazine
Prices update from retailer feeds; a listing we could not verify in the last 7 days shows “Check price”. Gunforma may earn a commission on retailer links. Links to a maker's own store earn us nothing.
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Last reviewed 2026-10-02