Sig Sauer · P365 family
Sig Sauer P365 X
The base P365 slide under an X-series grip module: the shortest slide that is optic-ready across the current line.
Specifications
ModelP365 X
Slide length3.1"
Barrel length3.1"
Integrated compensatorNo
Factory capacity12+1
Grip module familyp365xl
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 X
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/X/XL 9mm 12rd MagazineCapacity 12 rounds
Flush fit — Factory magazine for the P365X and P365-XL
Not available in: CA, CT, DC, HI, MA, MD, NJ, NY, RI, WA
AMAG 15 SG9 P365 9mm 15rd MagazineCapacity 15 rounds
Fits with an included part — Fit the included X/XL grip extension
Not available in: CA, CT, DC, HI, MA, MD, NJ, NY, RI, WA
P365/X/XL 9mm 15rd MagazineCapacity 15 rounds
Fits with an included part — Swap to the included P365X / P365-XL baseplate; extends below the grip
Not available in: CA, CT, DC, HI, MA, MD, NJ, NY, RI, WA
AMAG 17 SG9 P365 9mm 17rd MagazineCapacity 17 rounds
Fits with an included part — Fit the included X/XL grip extension
Not available in: CA, CO, CT, DC, HI, IL, MA, MD, NJ, NY, RI, VT, WA
P365 9mm 17rd Magazine (All 9mm Models)Capacity 17 rounds
Fits with an included part — Swap to the included P365X / P365-XL floor plate; extends below the 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 — MACRO-length body with a +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 — Works, but leaves a gap between the baseplate and the shorter grip (per SIG)
Not available in: CA, CO, CT, DC, DE, HI, IL, MA, MD, NJ, NY, RI, VT, WA
Doesn’t fit the P365 X: AMAG 10 SG9 P365 9mm 10rd Magazine, P365 9mm 10rd Finger Extension Magazine, P365 9mm 10rd Flush 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