Question: are glock 17 and 19 barrels interchangeable?
Answer: The Glock 19 has a shorter barrel (by about half an inch) and pistol grip compared to the Glock 17. ... Another advantage of Glock 19 pistols is that they are compatible with Glock 17 magazines but Glock 19 magazines cannot be used in a Glock 17 pistol.