Ask the Community
Get answers from fellow firearm enthusiasts and share your knowledge with the community.
Thuan, either of the Sig Romeo's mentioned will be great on the Ruger Carbine 9mm. You want the smallest dot you can get for going out to 100yrds. They are clear, durable and have sharp and not washed out dots for sighting.
I would go with a red dot such as the Romeo 4 that would mount low because the Ruger Carbine has a stock meant for a low mounted sight. High mounted sights would force you to shoot with your head erect and unsupported which is never good. Also the 9mm cartridge is ideal at short range. At 100 yards accuracy would start to deteriorate especially if there was wind. Trajectory would be similar to 22LR. We shoot regularly to 200 yards with ours and they seem best at 50 yards and under. https://www.budsgunshop.com/catalog/product_info.php/products_id/712013078/SIG+ROMEO4M+RED+DOT+2MOA+RUGGEDIZED+GRAPHITE
Hi Thuan, This is the Red dot you need buddy - budsgunshop.com/catalog/product_info.php/products_id/712013078/SIG+ROMEO4M+RED+DOT+2MOA+RUGGEDIZED+GRAPHITE