More info than you wanted but...
To help ease confusion, I’ve written this brief reference guide for SIG Sauer sight numbers and sight heights. Keeping them straight can be confusing, so I wrote this guide as much for myself as anyone else. 🙂 Which SIGs Use Which Heights? For classic P-Series pistols, the “general” rule for...
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6.22" sight radius p226, p220
4.86" sight radius p365
Number_Front Sight Height____Rear Sight Height
#4_______N/A____________________5.24 mm / 0.210 in
#5_______6.01 mm / 0.235 in____5.52 mm / 0.220 in
#6_______5.88 mm / 0.230 in____5.80 mm / 0.230 in
#7_______5.74 mm / 0.225 in____6.07 mm / 0.240 in
#8_______5.60 mm / 0.220 in____6.35 mm / 0.250 in
#9_______5.46 mm / 0.215 in____6.62 mm / 0.260 in
#10______5.32 mm / 0.210 in____6.9 mm / 0.270 in
note: higher numbers on front and rear raises point of impact