Barrels for the small frame standard, competition, and long models are not interchangeable the Gen 4 and Gen 5 locking blocks (and barrel locking lugs) are different. The Gen 4 uses #1447 and the Gen 5 uses #7894. Best regards, Bob. Don't practice until you get it right practice until you can't get it wrong.
Go with Gen 4 or even better is the Gen 3. Two of my Emergency response team members ordered the Gen 5 G26's and both had jamming problems. One had the slide lock release lever spring jump out of place. I am not a fan of the ambidextrous slide release lever modification Glock did in the Gen 5. I currently have, and/or have owned 7 Glock Gen 3's.
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The Gen 4 is slightly slimmer at 1.26 inches overall width. The weight of the Gen 5 with a full mag of ammo is the same as the Gen 4. Both guns come in at 30.16 ounces fully loaded. There are some obvious changes to the Gen 5 that experienced Glock shooters will notice right away. MGT3R.