View Full Version : DSA metric ( hammer - trigger - sear ) modified to work in inch
February 19, 2001, 20:00
Can DSA's hammer/trigger/sear be modified to work in an L1A1? I suppose given enough time and $$ ANYTHING is possible http://www.fnfal.com/forums/wink.gif , but is this a viable solution to the frustrating shortage of quality US made internals?
[ October 21, 2001: Message edited by: gary.jeter ]
February 19, 2001, 20:39
I modified my US metric fire control parts to work in my inch gun. Actually the only part I had to modify was the trigger and the trigger/sear hole through the lower receiver. Now a metric sear and hammer will drop right in and 10 minutes in front of a grinding wheel will add a metric trigger. Note: I experimented on an imported metric trigger first before commiting my American trigger.
February 20, 2001, 07:10
As a follow up, what did you do to the trigger? Simple idea but may save a lot of triggers being ground up to find out what you did.
February 20, 2001, 11:58
Beware also you may defeat the trigger heat treat. Your trigger may wear, and cause fire control malfunctions, depending on what yoo modified.
1*.....Train Like You Fight: Second Place is NOT an Option.
E.M. (Ted) Dannemiller II
February 20, 2001, 18:42
I compared the two triggers by putting one ( inch ) on top of metric. I ground the back of the metric where there is more metal than on the inch. This is where the trigger return spring hole is. This hole has to be ground down to a dimple other wise the inch return spring rod will get stuck in the hole and make dissasembly a nightmare. A little has to be removed from the horizontle surface above the rear of the trigger as well. I did this to a FA trigger but would not do it to a DSA trigger. The FA's have to be fitted anyway and they're a lot cheaper. This worked for me but may not be for you. Also it looks like inch fire control parts will be available soon and that would be the way to go.
February 20, 2001, 18:50
February 20, 2001, 19:42
how did you compensate for the larger hole diameter in the metric hammer? Did you just drill the receiver hole larger and use a metric pin? I bought some carbide drills and reamers specifically to modify DSA hammers - but they are very hard.
Can you take a pic of your modified trigger?
Are you using without the sleeve? The trigger is soft - around RC 38 and easy to drill, but the sear - if you are still using the original pin and sleeve, how did you machine the oval larger?
T. Mark "Gunplumber" Graham
Arizona Response Systems
5501 North 7th Avenue, Phoenix, AZ 85013
February 21, 2001, 00:14
I used number drills to ream the hammer pin holes in the lower as well as the trigger holes. Used drill chuck that goes in tailstock of my lathe and reamed by hand. Only five thousands diff or so and was easy. Got the lower at a show for $10.00 and wasn't concerned about screwing up. Already had a metric lower on the gun so figured if it worked out I'd be a step ahead. BTW all the internals in the lower are metric except selector. I like inch selectors and charging handles. Just got an Aussie inch kit from FA and the metric hammer pin goes right in. No sleeve on the trigger/sear just straight metric. Maybe I got lucky. All I know is it works great. Might be able to post pics in a week or so. Hey whats the command line for posting pics to this site I'm tired of adding links to photopoint. BTW the FA parts are very hard as well. Use mounted diamond on their undersize holes. Cuts like a bitch. Didn't change the sear oval used as is. I think I covered everything.
October 21, 2001, 12:00
October 21, 2001, 12:55
I'm just curious as to why????? With FSE inch parts available for a lot less that do just as good if not better, why bother?
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