dura-coat on an auto-loading .308

[lostsniper308]

I couldn't find a better place to put this topic but,
I'm asking if anyone knows that when finishing a rifle with finish like dura-coat, if the inside of the receiver is to be coated as well.
Specifically a receiver to a H&K91 type receiver.
I have a project build i'm attempting and i have a kit of HK dura coat and i'm just trying to clarify if the inside of the reciever is coated

[mattl]

No, don't coat the inside of the reciever.

[lostsniper308]

its an unfinished receiver, what should i do for the inside of it?

[Arier Blut]

As Matt said don't paint inside. Blue it.

http://www.brownells.com/aspx/ns/store/ProductDetail.aspx?p=1072&title=OXPHO-BLUE~

The rollers control the bolt gap which is detrimental to the cycling of the 91. If painted it could cause an uneven surface, or to thick it could increase bolt gap out of spec. The one above, you rub it in so it spreads extremely thin and uniform. It's much like applying stain, just rub excess away. While you are at it touch up any bare metal. Such as  under the trunion and on the cocking lever rod and interior of tube. You may as well do the outside of the receiver as well just in case the paint scratches you will have a little more time to get more on if you don't notice right away.

Painting like you are doing, is much better on the 91. The parkerized metal rusts very easily unless you keep it coated in oil. I just used rustoleum ultra flat on the exterior. It has held up for 8 or 9 years as a deer rifle. No scratches through paint yet, the duracoat is supposed to be tougher.

[lostsniper308]

Yes, i do have gun blue around and i ordered a kit of HK semi-gloss Dura-Coat for the HK type rifle.
I will be coating an AR15 as well, replacing the A2 upper receiver with an A3, to get the finish to match

[mattl]

I agree with Arier Blut.  And would like to add ( in case you have never used cold blue), to oil all the places you cold blued.  Cold blueing, like hot salts blueing, is a controled rusting process.  If you don't oil after cold blueing, it will sometimes continue to rust the part too far.  You don't know how many firearms I have seen with rusted areas that a customer used cold blue to touch up. 

Good luck with your project Lost Sniper.

Matt