If you've ever had the chance to look at the feed ramps of several barrels, you may have noticed that they come in many different shapes and sizes. They all fill a key role in the reliable operation of a semi-auto pistol as they help guide rounds from the magazine into the chamber of the barrel. Some firearm manufacturers will polish the feed ramp and others ignore the ramp and leave it full of machining marks. It's all a trade-off of the cost to polish the ramp vs. the enhanced feeding reliability of the pistol. I've seen barrels with feed ramps full of deep machining marks that function really well. I've also seen pistols with ugly feed ramps that cause feeding issues where the bullet jams into the feed ramp and causes a failure to feed.
If you have a barrel with a rough feed ramp, and it's impacting the feeding reliability of the pistol, here is a very low impact way to go about polishing up the feed ramp. I'm a bit OCD when it comes to cleaning my pistols so I do this polishing process with the Lone Wolf barrels to make them easier to clean. Before polishing, it's not uncommon to see copper deposits on the feed ramp as shown in the photo below.
In the photo below you can see that the Lone Wolf barrels come with a buffed finish on the stainless steel that leaves a pattern of very fine scratches across the feed ramp. Do they work well with this finish? Yes they do. Are they more difficult to clean? Yes they are. For this reason, I like to remove the factory finish and replace it with a high polish.
Here are the barrels I started with.
Here are the barrels after investing a couple of hours polishing the ramps. It's a dramatic improvement. Not up the quality of work you would get from a professional Gunsmith, but it is a serviceable result.
If you attempt this, please make sure to clean your barrel before and after polishing. It's not difficult to end up with some polish residue in the chamber when you are done. You will want to be sure the chamber and barrel are free of all polishing residue before using the barrel.