Hey guys! I just love the 66/77 line of rifles. I found this on the Yahoo site and hope it helps. This is someone else's work, not mine.
Dear nikOn611 and others: Your Nylon 66 cartridge feeding problem
seems a common one with this butt stock, tubular magazine. A simple
adjustment to the cartridge stop that you and other Nylon 66 users can
do using a Dremel or similar tool serves to completely eliminate the
problem. I did this adjustment some time ago for a friend whose rifle
is now functioning perfectly.
As you've guessed, your feeding problem lies with the cartridge stop
mechanism. Because I do not have a large enough parts diagram to be
of help to us, nor do I have access to a Nylon 66 rifle in order to
refresh my memory on the precise configuration of the cartridge stop,
I will simply describe the basic procedure, trusting to your
mechanical acumen to visualize the parts relationships I'll outline
and then to be able to proceed as I'll suggest.
Before fully dismantling the rifle, observe the function of the
cartridge stop. The cartridge stop is a fairly substantial sheet
metal part that rotates on a pin and uses a small, 90 degree sheet
metal lip to engage the rim of the following cartridge as a preceding
cartridge is fed into the chamber. This stop lip serves to prevent
multiple feeding when it properly and securely engages the the rim of
the following cartridge, and herein lies the problem. In apparently
many rifles, this stop lip does not bear firmly enough upon the
following cartridge to effectively engage its rim and so to reliably
function as a stop. If you will examine the cartridge stop part, you
will find that at approximately the other end of the part, past the
rotating pin, there is another portion of the part that by contact
with another surface controls the amount of rotation available to the
entire part and its stop lip and thereby the the amount and firmness
of the stop lip's engagement with the following cartridge. As I
recall, this motion limiting portion of the cartridge stop part is
another flat surface parallel to the cartridge engaging surface of the
stop lip. Removal of a few thousandths from this motion limiting
portion will allow the entire cartridge stop part to rotate a little
farther, pressing the stop lip more firmly against the following
cartridge. Use of a fine grit grinding wheel on a Dremel tool or
other small, rotating grinder is the way to go. Be careful not to
remove too much; cut and try. The rifle I worked on required VERY
LITTLE grinding. This small amount of grinding will totally eliminate
what seems a vexing problem for many and will serve to renew your
confidence in what was a very innovative but apparently sometimes
poorly executed design.
The repair is simple and absolutely effective. Let me know if the
adjustment works out as well in your hands as it did in mine.
Regards, oepaqu
Hope this helps you guys.
Aaron
p.s. Here's the link for the Yahoo group
http://sports.groups.yahoo.com/group/nylonrifles/
