[gregskey]

Hi all, I recently purchased a Sig 556 ER model and have a question regarding the fit of the forward hand grip (top and bottom) into the gas block. There is about a 1/16" amount of movement from left to right, and top to bottom of the hand grip within the gas block when the hand grip is flexed. Is this normal? I don't have access to an identical rifle to compare.
I realize there must be some gap, otherwise it would be nearly impossible to remove the top and bottom grip, but is 1/16" of play normal? Also,
is there any recommended method of break-in of the rifle. The manual doesn't mention anything about break-in. Thanks for any suggestions.

 

[Dem People]

Here is the break in part
Link: http://www.sigarms556.com/viewtopic.php?t=1428

 

[cndrdk]

I guess everyone has his own method of making the hand guards fit to the gas block. Me, I took a lighter and heated the middle of the top and bottom guard. I then took a pair of large needle nosed pliers, gripped about 1/4 of an inch in, and slightly bent a "V" up in the middle of the top and bottom sections. Worked for me, no more up and down movement.

 

[gregskey]

Thanks for the break-in link and suggestion for modifying the grips to fit. I'm going to give it a try. I'll let you know how it works out.

 

[ullie]

...gregskey

...it's perfectly normal to have "some" play in the handguards...if it really bothers you...you might try to build up the front lips with small strips of electrical tape...better yet some "stove gasket" if you're going to get her really hot...you don't want to get them too tight though...especially the upper handguard...or you "may" break off the lip during disassembly if you're not careful...i wouldn't worry about it unless it's really excessive...

 

[gregskey]

Ok, this is how I fixed the loose grip problem(s). I cut a small 1/2" o-ring into 1/4's and then wedged one of the pieces between the top hand grip and the gas block using a small flat blade screwdriver. I also installed two very small o-rings, one on either side of the front pin. These two techniques solved the loose grip problem.

 

[goo]

...gregskey

...it's perfectly normal to have "some" play in the handguards...if it really bothers you...you might try to build up the front lips with small strips of electrical tape...better yet some "stove gasket" if you're going to get her really hot...you don't want to get them too tight though...especially the upper handguard...or you "may" break off the lip during disassembly if you're not careful...i wouldn't worry about it unless it's really excessive...

That is a great idea. I have alot of play in my front handguard.

Speaking of "really hot"

Is there a recommended max use before overheating. I'm guessing these guns are desinged to be shot in full auto and handle alot of rounds in a combat scenario, but just curious if possible damage or a recomended level for casual outings. I ask this because last weekend I shot 3 30-round mags back to back, as fast as possible. That was 90 rounds in a little over a minute. My barrell was really smoking. Literally, there was alot of smoke coming out of the vents on the handguard. I touched the barrell out of curiousity and it was damn hot. I never thought 90 rounds would be a problem, but now that I saw smoke and heat am curious?

Thx

 

[AFkiwi]

You can also remove the handguards, build up the top and bottom flanges with jb weld where it inserts into the gas block, then sand to a perfect fit. Tape off the ends and spray paint black with krylon fusion. Worked 100% for me, I can get them on and off and there is NO play at all in my fishgills. Looks great as well!