a_cement_mixer

I have had a Model 21 gen2 for about 11 years now. Wonderful Glock perfection. The most reliable gun I have ever owned. For several years I have been admiring the tactical rail on the gen3 and gen4. So two weeks ago I purchase a used Model 21 gen3. The problem. It won't reliably feed all types of ammo like my gen2. After countless hours of evaluation and shooting every combination of ammo and mags, I found a problem. The barrel feed ramp. If I put my gen2 barrel on my new gen3 frame the...