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View Full Version : Fire lapping procedure


bikenjam
January 29, 2006, 09:03 PM
I just put a new DPMS 24" heavy barrel on my varmint AR-15. I've tried a few handloads through it and it shoots well, but fouls out bad after about 20-30 rounds. On my last DCM barrel i used the Tubb Final Finish system which seems to have worked great. 1" groups at 200 yards seems to never foul out (never put more than 100 through in one sitting) This is all leading up to a question on the wheeler engineering lapping system. I have it and was wondering if instead of shooting 5 of each grit, if i shot 2 off the 1st(i think its 220 grit), 3 rounds of the second(400 grit?), and 4 of the third (600 grit). I'm hoping for it to smooth it out while not moving the lands forward too much. What do you guys(and gals) think?

marks655
January 29, 2006, 10:03 PM
Did you try scrubbing it good with JB cleaner? I had a new Bushmaster stainless AR-15 that fouled some and the JB (the grey stuff followed by the pink 'polishing' formula) stopped the fouling and got it under 1 MOA.

impact
January 29, 2006, 11:26 PM
The only thing I don't like about fire lapping is that it will move your lands back. In some cases alot! This is a one way road. once you do it you can't go back. Just make sure this is something you want to do! I was reading some where that a rough barrel will copper foul less than a smooth barrel. Wish I had the link! There may be another way to get less copper fouling without using fire lapping.