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Same type of experience with John. He took a functioning Mk-IV, and essentially rebuilt it and refinished to where it looks perfect and functions flawlessly. Even with something like refinishing magazines, John clearly takes pride and ownership of everything he does, with speedy turn-around...

Icer: Here you go: M4 x 10mm https://www.newegg.com/Product/Product.aspx?Item=9SIA4SR6UV0707&cm_re=a15081100ux0679-_-9SIA4SR6UV0707-_-Product This is the tiny set screw used in a lot of the conversions, therefore there should be no modifications required to the gas block. Enjoy!

Guys: The FNC the threaded screw in the gas block fell out of continues to reside at the dealer awaiting paperwork. We were not in a huge hurry to replace it, and our resident gunsmith managed to eventually locate the original thread pattern/hex head at, of all places, Newegg.com. Runs much...

Paco - thanks so much for the lead and I will follow up with our fellow member. I concur, keeping these highly collectible firearms as close to original as possible is always a great idea. Thanks!

Copper - that may be our last resort, as we are trying to keep these rifles as close to original as possible. Do you have any idea what this port/set screw is for? Thank you.

Dash: Great find! I am trying to confirm with the seller it is the same, very small set screw we are discussing, but have not yet received a response. Any idea what this particular port/screw is for? Thank you.

Okay, so we tried to cannibalize the small set screw in the front of the FNC gas block installed in the semi-auto, and it turns out it was staked, and never going anywhere. Between the two, the FA should have been staked and it wouldn't have departed the premises. Does anyone have a parts...

I know parts for our treasured FNCs are tough to come by. During a recent FA session with our most recent FNC with S&H sear, a screw apparently fell out of the gas block, turning it into the queen of the 2-round burst (only). We have a semi we can cannibalize, but wondering if anyone is aware of...

Similar but different Mac 10s in .45 with Lage uppers Bullet hoses: One early serial number Powder Springs Mac and one later with Lage uppers, suppressed, etc. in .45. They both function flawlessly.

Okpud: Thanks so much for the great explanation! And the link! We very much appreciate it, and will check them out during the next range trip. Thanks again!

Guys: Slightly off topic, but please bear with me. We have FA and SA versions of the FNC. Recently noticed that the gas selector seems to have a total of four positions. With the original FN hand guard it is not overwhelmingly obvious because the guard prevents the selector from going all the...

All: a little bit of a story here. We purchased a Powder Springs Mac 10 in .45, reportedly NIB (very early serial number). Well, we decided to shoot it and it ran quite poorly at best. Noticed there was a lot of vertical slop with the mag. Like any other time we have an issue, I sent it off to...

Nuge: We have been converting almost all of our cleaning over to FrogLube products. The CLP is a superior lubricant and preservative in all respects. FrogLube recommends MPro7 for areas that may not be reachable with the CLP and liquid forms of the basic product, and as an example I shot some...

These photos show John Andrewki's superb workmanship and skills in repairing, rebuilding, reassembling, and refinishing or MK-IV. John uses a welding technique very similar to that used by the original Sterling factory, and the strikingly accurate welds in assembling dissimilarly shaped metals...

All: The unveiling of the NIB MK-III and the removal of the rest of the aged Sterling masking tape took place today. As we suspected it came off very easily, and was quite gooey after being applied in either 1955 or 1956. The firearm cleaned up beautifully, and truly reflects the workmanship of...

nuge: The tube was reportedly fine, and quite frankly it seemed as though it functioned quite well. It is an 8XXXXX DLO, unusually this particular MK-IV had the serial number on the mag well where it would normally appear on the original Sterlings, which we wanted to keep in place at all cost...

Talking with John Andrewski he confirmed that the Sterling is designed such that the case does not sit all the way down in the barrel, which helps account for its superb reliability.

Many, many magazines through the newly refurbished MK-IV today and she runs beautifully with original Sterling magazines. I recalled some issues with the double stack Sterling clones that are welded together. Can't recall where they came from but have decided to use them with the MK-8 SA version...

Guys: Just received the rehabilitated MK-IV that started life as a Don's Guns build many, many years ago. Something I wanted to do for a long time was get it to John Andrewski so he could apply the talents displayed with our MK-5 build, also from John. Not only was the MK-IV in serious need of...

Hmmmmm. Seems like something has drawn the Major's attention away from that superb firearm. Wonder what could possibly cause this diversion? ;-)