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Posted: 9/30/2014 9:25:17 AM EST
When I build my upper I intend to lap the receiver before I bolt the barrel up. My question is has anyone had trouble using the Browneels lapping tool on a Mega forged upper? I read a post from way back in 2011 where a user stated the tool wouldn't fit the Mega upper. Just wondering if this has been addressed, or if it's still an issue. I have access to a lathe, but I like the simplicity of using the lapping tool with a drill and some compound.

Thanks everyone in advance.
Link Posted: 9/30/2014 4:40:43 PM EST
Lapping a forged Mega upper is borderline retarded. Don't do it!
Link Posted: 9/30/2014 4:55:09 PM EST
No, the lapping tool will not fit in mega forged receivers as they have tighter spec in the barrel extension
Link Posted: 9/30/2014 10:24:57 PM EST
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Originally Posted By Hydra-shokz:
Lapping a forged Mega upper is borderline retarded. Don't do it!
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Is the machining just that good?
Link Posted: 9/30/2014 10:37:46 PM EST
Mega makes great uppers, lowers, etc.

I wouldn't mess with it.
Link Posted: 9/30/2014 11:26:46 PM EST
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Originally Posted By RyanO20:


Is the machining just that good?
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Originally Posted By RyanO20:
Originally Posted By Hydra-shokz:
Lapping a forged Mega upper is borderline retarded. Don't do it!


Is the machining just that good?


Yes. All I use is Mega forged upper and lowers for my builds. There is no need to mess with them in any form whatsoever.
Link Posted: 10/2/2014 12:06:24 PM EST
You can "bed" the same surface with locktite and get the same results. Just because Mega has a good rep doesn't mean that the barrel extention is perfect. Just don't use the permanent or heat releasable version of locktite. YMMV

Advntrjnky
Link Posted: 10/2/2014 12:38:37 PM EST
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Originally Posted By advntrjnky:
You can "bed" the same surface with locktite and get the same results. Just because Mega has a good rep doesn't mean that the barrel extention is perfect. Just don't use the permanent or heat releasable version of locktite. YMMV

Advntrjnky
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Don't do this. You will regret it later when you decide to remove the barrel.

A properly torqued barrel nut does not require "bedding". The estimated clamping load between the front face of the receiver and the barrel extension flange at 80 lb-ft of torque is nearly 20,000 lbs. Believe me, it is not going to move.
Link Posted: 10/2/2014 3:38:20 PM EST
[Last Edit: 10/2/2014 3:39:39 PM EST by Hydra-shokz]
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Originally Posted By Russ4777:



Don't do this. You will regret it later when you decide to remove the barrel.

A properly torqued barrel nut does not require "bedding". The estimated clamping load between the front face of the receiver and the barrel extension flange at 80 lb-ft of torque is nearly 20,000 lbs. Believe me, it is not going to move.
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Originally Posted By Russ4777:
Originally Posted By advntrjnky:
You can "bed" the same surface with locktite and get the same results. Just because Mega has a good rep doesn't mean that the barrel extention is perfect. Just don't use the permanent or heat releasable version of locktite. YMMV

Advntrjnky



Don't do this. You will regret it later when you decide to remove the barrel.

A properly torqued barrel nut does not require "bedding". The estimated clamping load between the front face of the receiver and the barrel extension flange at 80 lb-ft of torque is nearly 20,000 lbs. Believe me, it is not going to move.


This.

I also use a thin layer of grease between the barrel extension and the upper receiver. This also helps with locking the two parts together. Kinda of a suction type thing. I use MIlitec 1 grease. A little is that is needed.

I have yet to find any stripped upper receiver that would benefit from lapping. YMMV.
Link Posted: 10/2/2014 9:35:19 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Hydra-shokz:


This.

I also use a thin layer of grease between the barrel extension and the upper receiver. This also helps with locking the two parts together. Kinda of a suction type thing. I use MIlitec 1 grease. A little is that is needed.

I have yet to find any stripped upper receiver that would benefit from lapping. YMMV.
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Originally Posted By Hydra-shokz:
Originally Posted By Russ4777:
Originally Posted By advntrjnky:
You can "bed" the same surface with locktite and get the same results. Just because Mega has a good rep doesn't mean that the barrel extention is perfect. Just don't use the permanent or heat releasable version of locktite. YMMV

Advntrjnky



Don't do this. You will regret it later when you decide to remove the barrel.

A properly torqued barrel nut does not require "bedding". The estimated clamping load between the front face of the receiver and the barrel extension flange at 80 lb-ft of torque is nearly 20,000 lbs. Believe me, it is not going to move.


This.

I also use a thin layer of grease between the barrel extension and the upper receiver. This also helps with locking the two parts together. Kinda of a suction type thing. I use MIlitec 1 grease. A little is that is needed.

I have yet to find any stripped upper receiver that would benefit from lapping. YMMV.


I've got some Aeroshell 33 MS for this reason. I agree, all be it unfounded, that all uppers can use a lapping. Even if the machining were 'perfect' confirming this on a lathe with a few .001's of material could only be peace of mind if nothing else.
Link Posted: 10/2/2014 9:44:33 PM EST
I have six Mega Monolithic uppers and they all shoot sub MOA with no bedding or lapping
Link Posted: 10/2/2014 9:47:29 PM EST
Clamping force doesn't square up a receiver or barrel extension. When done right locktite works well for this type of bedding (as does truing the mating surfaces like mentioned by the OP). The poster that hasn't seen a receiver that needs squaring probably hasn't actually checked too many of them. Granted, I have heard very good things about Mega's consistent quality, but when you are building for the highest level of accuracy or shooting calibers that have more recoil energy than 5.56 it is a small investment that should pay good dividends.

advntrjnky
Link Posted: 10/2/2014 9:51:01 PM EST
5 of mine are 6.8 rifles shooting very hot loads
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