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Posted: 2/18/2017 9:08:10 AM EDT
[#1]
It can be done. Sounds like you already know what you need to know to do it. I don't know how far to shorten the spring. I'd just start experimenting with it.
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Posted: 2/18/2017 10:07:15 AM EDT
[#2]
I was doing that on my new builds for a while. Go slow tapping, use plenty of cutting oil and back the tap out often to clear out the cut.
That tap can break easily, I think it is a 4-40. We had a thread running years ago on this . Tapping rear detent |
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Posted: 2/18/2017 10:26:50 AM EDT
[#3]
Thanks for the feedback. With this issue I was mostly concerned that someone would say "I shortened the spring and now it doesn't work right".
This opening looks larger than the one for the takedown pin spring and will need a larger set screw. Haven't done any measurements yet. I was wondering, they must have had a reason for making the springs so long if the shorter ones will work and you would not have to put it together like trying to put the pin back in a grenade. |
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Posted: 2/18/2017 11:05:25 AM EDT
[#4]
It probably "can" be done done, but it won't leave a lot of spring to compress once the set-screw is installed flush. You might run into issues with the safety selector being very stiff.
On the rear takedown spring, I usually cut a couple coils past the length of the set-screw. Here, you'd be cutting off not only the set-screw length, but also the excess that goes into the pistol grip. |
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Posted: 2/18/2017 11:05:29 AM EDT
[#5]
Quote HistoryQuoted:
Thanks for the feedback. With this issue I was mostly concerned that someone would say "I shortened the spring and now it doesn't work right". This opening looks larger than the one for the takedown pin spring and will need a larger set screw. Haven't done any measurements yet. I was wondering, they must have had a reason for making the springs so long if the shorter ones will work and you would not have to put it together like trying to put the pin back in a grenade. SAFETY DETENT? The hole for the safety detent is only about 3/8 inch deep, some of that is for the detent itself, some is required for the detent to move, and some will be taken up by the screw. Your not going to have enough room for a spring. Do a little measuring, see how much room you actually have. |
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Posted: 2/18/2017 8:59:02 PM EDT
[#6]
Quote HistoryQuoted:
SAFETY DETENT? The hole for the safety detent is only about 3/8 inch deep, some of that is for the detent itself, some is required for the detent to move, and some will be taken up by the screw. Your not going to have enough room for a spring. Do a little measuring, see how much room you actually have. That is what it looks like to me. I haven't measured yet but it just looks like the hole is too shallow and It would shorten the spring too much. I saw a thread here a while back where someone was using a small ball bearing as a detent. Any other ideas are welcome too? |
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Posted: 2/18/2017 9:33:57 PM EDT
[#7]
seems to me you might be able to thread it but use a hollow screw to hold the rest of the spring?
that way you get what you need as it is self contained. worst case you have to drill out the pocket in the grip to fit over the screw/bolt. |
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Posted: 2/18/2017 10:06:31 PM EDT
[#8]
 
This is what you need to cut clean threads in Aluminum |
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Posted: 2/19/2017 12:20:19 AM EDT
[#9]
Safety detent, not take down detent. My bad.
As you were. I don't think there is enough room there like the takedown hole. |
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Posted: 2/19/2017 7:03:51 AM EDT
[#10]
Quoted:
First build, I used a Bushmaster XM-15 lower. The gun works very well. As I live in NYS I have to use the Thordsen stock when at home. It looks like a big checkmark but it actually works pretty well off the bench. When I go out of state for matches or just for shooting, I want to put the pistol grip and Magpul stock back on. (the gun balances better and reloads easier when moving) I was looking to put a set screw behind the safety/selector detent spring (like the takedown pin spring) to make putting the pistol grip on easier. Anyone ever make that change or know for a fact it won't work? The spring extends pretty far into the grip and would have to be shortened. 'How to' post, in this same forum, just a little over a week ago. It's still on this same page. Better Selector function (how to) |
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Posted: 2/19/2017 5:56:33 PM EDT
[#11]
Quote HistoryQuoted:
'How to' post, in this same forum, just a little over a week ago. It's still on this same page. Better Selector function (how to) That is the post I saw but I thought it was much older. Then I couldn't find it. Have to give it a try on an old lower first. Thanks all. |
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Posted: 2/20/2017 12:18:50 AM EDT
[#12]
The correct tap size for the hole is 8-32. I use a 3/16" length set screw (8-32).
A 1/8" ball bearing is used for the detent itself. I found that a 0.12 outside diameter steel compression spring is just the right size. The link posted above has the SKU number for that spring at McMaster-Carr. You almost always have to clean up the hole for the ball bearing to move smoothly through the channel. A round file or a 1/8" drill bit will do it. It's an easy and worthwhile modification. I like being able to change grips without worrying about losing parts, and I get a better feel on the selector movement. G. |
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