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Posted: 7/11/2024 3:41:41 PM EDT
Does anyone have DIY instructions for clipping an SUO HK-33 lower for a PTR? I'm not concerned with the pinning part, extra work for little gain.
Mainly, what tools, short of a mill, can be used to trim the inside ears to fit the semi shelf. I know I can buy one already done, but, I already have this one, so, if not impossible, figured I'd give it a try. Thanks. |
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Posted: 7/11/2024 4:26:08 PM EDT
[#1]
I been doing all mine with files (rough and fine) and calipers. The first I’d did was an SEF clipped for a PRT9. I just measured the shelf and ear spacing. Subtract the diff and divided in half and took that amount off each ear till had a slip fit. Then mated up the slot in lower to shelf. Be conscious of the line between the receiver and top of lower. Keep same gap when mating the lower’s slot to the shelf. Take too much off the top or bottom and the lower may drop down in the front and cause malfunctions. Just take your time. I’ve done around half dozen this way.
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Posted: 7/11/2024 10:47:30 PM EDT
[#2]
Quote HistoryOriginally Posted By chargerdude70: I been doing all mine with files (rough and fine) and calipers. The first I’d did was an SEF clipped for a PRT9. I just measured the shelf and ear spacing. Subtract the diff and divided in half and took that amount off each ear till had a slip fit. Then mated up the slot in lower to shelf. Be conscious of the line between the receiver and top of lower. Keep same gap when mating the lower’s slot to the shelf. Take too much off the top or bottom and the lower may drop down in the front and cause malfunctions. Just take your time. I’ve done around half dozen this way. This is exactly what I figured it took. Damn....  Well, I needed an excuse to buy a couple more new files, so thanks! |
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Posted: 7/12/2024 9:11:47 AM EDT
[#3]
As long as you have a receiver with a semi-auto shelf, you can clip a housing without having another as a pattern.
Just measure the width of the shelf with calipers or mics, then measure the space between the existing ears. Subtract the space between the ears from the width of the shelf, and divide by two. That is how much has to come off of each ear. Trim an extra .005 off of each side for a little clearance. So let's say the shelf is .870 wide and the ears are .760 wide. That's a difference of .110, half of which is .055, plus .005 for clearance. So you need to cut .060 out of the inside of each ear. These numbers aren't actual, just an example. You don't need to trim the inside of the entire ear off, just the part that runs along the sides of the shelf. Then you'll need to open the slot up taller and wider as well to fit over the shelf. You can get the correct dimension by measuring from the receiver to the top of the shelf and making the slot in the grip just a few thousandths higher than that. |
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