Great advice! I got a CO2 replica of my 1911 with blowback to train inside the house. For many, it’s not worth the investment, but for me it adds several benefits: The blowback ensures proper grip when drawing and firing You can put up paper targets around the house and blast them with plastic BBs. It’s adequately accurate for up to at least 5 meters/yards to simulate bullet trajectory. Wear eye protection and make sure the house is empty, though. Although I don’t shoot BBs inside the house anymore since you’ll still find the plastic rascals everywhere for months after.