NPAP: Single stack to Double Stack

[William]

Found a good deal on a single stack npap (http://www.centerfiresystems.com/ri2089-n.aspx). Been looking at youtube and there are some somewhat sketchy looking videos to increase the size of the magwell to fit the double stack. Is it difficult to do? Easy to screw it up?

[COcz]

If Century or IO can do it so can you. I'm sure you can screw it up if you go too fast. Some of the videos I saw looked like crap. I would measure (twice) and mark the opening as I want it then stop before I get there and go real slow, check fit, file, check fit, and so on untill it's just right. Get reference pics of a factory double stack to help out, or if you have another ak measure all the pertinent areas.

Is it worth it? Only for you to judge. I'm sure a competent gunsmith could do it for a reasonable fee as well.

[beast556]

You have to change the bolt out to a regular akm bolt they come with a single stack bolt. Opening the magwell is the easiest part the trunion needs to be milled also and finding a new bolt to headspace correctly will be the chalange. Unless you want a project it is easier to just buy one of the regular pap rifles

Almost forgot after you mill the trunion you have to re rivit the two rear rivets.

[beast556]

One more thing I forgot you have to grind down the bullet guide it is thicker because the single stack mag sits higer in the mag well. The one I had once it had everything done it ran like a champ.

[mtnrider]

Unless you are getting it for free I wouldn't bother. You can get one ready to go for pretty cheap these days.

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[William]

Thank you all for the advice. Sounds like a bit more than I am willing to take on.

[beast556]

Yea, unless you are looking for a project or something to mess with it is cheaper to get one of the ones that are good to go out of the box.

[BPTactical]

You have to change the bolt out to a regular akm bolt they come with a single stack bolt. Opening the magwell is the easiest part the trunion needs to be milled also and finding a new bolt to headspace correctly will be the chalange. Unless you want a project it is easier to just buy one of the regular pap rifles

Almost forgot after you mill the trunion you have to re rivit the two rear rivets.

Hit or miss on the trunnion, the last 3 I did had DS trunnions and no bolt swap was needed.
I think more are coming into the country this way.

[def90]

Depends if it has a double stack trunnion or not, most of these actually have a double stack trunnion. The bolt doesn't matter, a single stack bolt will work just fine. If it is a double stack trunnion a few minutes opening up the magwell is all that is needed. If it's a single stack trunnion a bit more work is required.

[Great-Kazoo]

Depends if it has a double stack trunnion or not, most of these actually have a double stack trunnion. The bolt doesn't matter, a single stack bolt will work just fine. If it is a double stack trunnion a few minutes opening up the magwell is all that is needed. If it's a single stack trunnion a bit more work is required.

The ones done needed the double stack, as the s/stack had issues picking up rounds. YMMV

[beast556]

the single stack bolt wil not work what so ever. It will only pick up the rounds from one side of a doubble stack mag. There are many versions of npap rifles that were imported. It seems as they got more popular it was easier for them to just use there mill spec parts than have proprietary parts made.

[def90]

All NPAPs have double stack bolts.. The original PAPs (notice no "N" in the part name/number) had the singe stack bolts. Most of the issues with the single stack bolts are due to magazine latch height issues. This has been gone over dozens of times over at AKFiles..

Confusion has grown because people will call a PAP a Gen 1 NPAP and regular NPAPs Gen 2.. There is no Gen 1 or Gen 2.. It is a PAP or an NPAP.