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Lowering the POI on a BT-99 Micro Midas.....How can it be done...... I am thinking Add-A-Rib?

4329 Views 36 Replies 26 Participants Last post by  grunt
My wife has a BT-99 Micro Midas that patterns 10" higher than the POA at 30 yards. There is an adjustable comb on the gun and it is all the way down. The BT-99 does have a Carey/Slick Slide on it. She cannot get used to a gun that patterns this high. Because of this she mostly shoots her Syren. She would prefer the BT, because the balance point is more rearward and this helps as she balances the gun on her forearm.

The only way I can think of lowering the POI is to use a product like Add-A-Rib? But doesn't this inherently cause issues as she will have to raise her comb, which in turn will elevate the POI? If she does not raise the comb, aren't you then looking at the back of the Add-A-Rib?

Any help is greatly appreciated,
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You will have the ability to drop the POI relative to the POA if you put an add-a-rib on it. Right now it looks like it's at the cusp of 70/30. Putting the lowest add a rib on it, 3/8" , will let you drop the POI to around 60/40, maybe a bit lower. In your pic, it looks like there might be one washer on the posts.
 

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Most add a ribs are the same height front to back or higher at the back to raise the gun's poi. Pat Laib, owner of Laibs Gunsmithing in Spicer, MN used to have short (2" or so) delrin ribs with a front sight attached, that screwed into the front sight hole in the existing rib. Because it was a little higher than the existing front sight, it lowered the poi.
 

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Discussion Starter · #5 ·
I should let everyone know that because she cannot get low enough, she does see a bit of rib between the beads.
 

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I should let everyone know that because she cannot get low enough, she does see a bit of rib between the beads.
If she is seeing rib between the beads, lower the comb. If its the whole way down, shave it or have a stock maker build a new one (so.you have the original.to.sell in the future )
 

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Having gone down this road I would recommend you not touch the wood. Rather, add a strip of balsa wood to the rib with double sided tape. Balsa wood strips can be had at most hobby shops and are very cheap. It is 1/8” thick. I experimented until I got the desired height and then sent the barrel to Keen Gunsights and they duplicated the rib in aluminum. Paired with my adjustable comb it works perfectly. Get a copy of RollinOswalds book on stock fitting. It is an invaluable resource for these things
 

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I would experiment with tapered strips of of wood to find out exactly what she likes.
Then have a duplicate made out of aluminum and glue it on with 3m double sided tape.
You may only need to make her new rib to come 1/2 to 2/3rds of the length of the barrel.
I would start with a peace .25" thick 2 ' long attach a bead and tie it on with bread ties.
Henry
 

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Take a yard stick and lay it on the rib and over the stock. Raise the front of the yard stick until the back is parallel with the comb. The gap and taper will appear under the yard stick that is over the barrel. That will show you the taper you need to get it to a 50/50 POA...... Just my opinion
 

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Take a yard stick and lay it on the rib and over the stock. Raise the front of the yard stick until the back is parallel with the comb. The gap and taper will appear under the yard stick that is over the barrel. That will show you the taper you need to get it to a 50/50 POA...... Just my opinion
Keen Sights has an add on adjustable rib
 

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You will have the ability to drop the POI relative to the POA if you put an add-a-rib on it. Right now it looks like it's at the cusp of 70/30. Putting the lowest add a rib on it, 3/8" , will let you drop the POI to around 60/40, maybe a bit lower. In your pic, it looks like there might be one washer on the posts.
You can tell by a pic that it prints 70/30 ?
Henry
 

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I would have to say your wife is seeing lots of space between the beads. If you? You need to have Carey/Slick Slide rework the recoil pad and comb to lower the comb another 1/8 to 3/16 to get the POI where is should be for your wife. Good Luck. break em all Jeff
Lower the comb by sanding until you get a figure eight between the beads. Refinish
with Tru Oil. Easy job.
 

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Lower the comb by sanding until you get a figure eight between the beads.
I would have Carey Slick Slide take 1/8" to 3/16" of a inch off the bottom of the comb they cut wrong and have them refinish the bottom of the comb for free!!! Since they did not do there job properly to start with. Just my 2 cents. break em all jeff
 
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