When the carrier is traveling rearward into the buffer tube does the buffer bumper make contact with the end of the buffer tube during the cycle of operation?
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When the carrier is traveling rearward into the buffer tube does the buffer bumper make contact with the end of the buffer tube during the cycle of operation?
Last edited by prepare; 08-20-22 at 06:31.
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Yes. Why?
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According to SOTAR this gap BAF12F50-196D-4002-A72B-FD42CC05FD71.jpeg should be a minimum of 2 quarters which is .133-.135Originally Posted by 1168
Having measured several I’m seeing a variation of .080 to .155
The .133-.135 minimum is to prevent the carrier key from impacting the lower receiver in the event the buffer bumper compresses.
Out of the guns I’ve measured that are less than .133 there’s no indication of carrier impact.
I’m wondering if there is a TDP spec for this gap?
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Chad from SOTAR knows his AR stuff, if he recommends a specific gap, you should probably follow his advice. IDK of a TDP specific gap, but I think Chad also says if the gap is on the low end, or there is contact, you can use one quarter as a spacer in the bottom of the receiver extension tube.
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Being a part time Armorer I get to measure stuff to collect data.
There doesn’t seem to be a baseline for this.
Last edited by prepare; 08-20-22 at 09:23.
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There is no specified gap, other than adding up the various lengths.
If you buy quality parts, you will wind up with the correct gap.
Buy quality and think about it no more.
Oh, btw, his numbers are too conservative, the length of the carrier, the length of the key and the depth of the hole plus the fact that one turn of the tube in ,063", mean the range is going to be greater that what he gives.
Last edited by lysander; 08-20-22 at 09:49.
Manufacturer
To answer the question directly:
Yes the bumper contacts the end of the tube.
It is the thing that stops rearward motion in the normal cycle of operation.
The bumper does compress slightly and then rebounds, adding to forward carrier velocity.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
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Thank you Clint!
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He didn't give a range. Only a minimum.
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