dmshozer1 Posted August 1, 2016 Share Posted August 1, 2016 Anybody know the thread size of the holes in the top of the receiver. Trying to mount a dot sight on it Link to comment Share on other sites More sharing options...
Dan Sierpina Posted August 1, 2016 Share Posted August 1, 2016 Dave, they should be 6-48. That's the "standard" for gun screws. If not, 8-40. Are there plugs in the holes that can be measured? Link to comment Share on other sites More sharing options...
Paul49 Posted August 1, 2016 Share Posted August 1, 2016 Or email Beretta's customer service. They've been responsive to me several times. Link to comment Share on other sites More sharing options...
dmshozer1 Posted August 1, 2016 Author Share Posted August 1, 2016 Dave, they should be 6-48. That's the "standard" for gun screws. If not, 8-40. Are there plugs in the holes that can be measured? Knocked the plugs out Dan but they are kind of out of round after doing that. You are probably right about the size. Off to the hardware store. Going to try a Burris Fastfire on it just for the hell of it. Link to comment Share on other sites More sharing options...
Dan Sierpina Posted August 1, 2016 Share Posted August 1, 2016 Good luck finding 6-48 screws at a regular hardware store! Brownells will have them. Link to comment Share on other sites More sharing options...
kurtm Posted August 1, 2016 Share Posted August 1, 2016 Hmm...Beretta......Italian........Metric threading. Just some random thoughts. Link to comment Share on other sites More sharing options...
Paul49 Posted August 1, 2016 Share Posted August 1, 2016 Hmm...Beretta......Italian........Metric threading. Just some random thoughts. Yes! It takes a 6mm hex wrench to adjust the seating depth of the sling swivel cup in the stock. Link to comment Share on other sites More sharing options...
Dan Sierpina Posted August 1, 2016 Share Posted August 1, 2016 The original question was for the rail mount screws on the top of the receiver. Link to comment Share on other sites More sharing options...
Paul49 Posted August 2, 2016 Share Posted August 2, 2016 The original question was for the rail mount screws on the top of the receiver. Yes, it was. However, Kurt pointed out the shotgun is Italian and likely has metric parts. I confirmed another part was indeed metric. We both suspect the rail mount screws will also be metric. I stand by my original recommendation to email Beretta's customer service. They will answer the question. Testing screws runs the risk of stripping threads. Link to comment Share on other sites More sharing options...
dmshozer1 Posted August 2, 2016 Author Share Posted August 2, 2016 Anybody know the thread size of the holes in the top of the receiver. Trying to mount a dot sight on it Found some screws in my junk box that fit, No idea what they are? Thanks for the help. Off to sight it in with slugs. Then see if I like it on bird shot targets. Link to comment Share on other sites More sharing options...
dogtired Posted August 2, 2016 Share Posted August 2, 2016 (edited) I think I used 6-48 plugs when I first got mine. I just verified. You are welcome. Edited August 2, 2016 by dogtired Link to comment Share on other sites More sharing options...
Dan Sierpina Posted August 3, 2016 Share Posted August 3, 2016 Thanks Dogtired. There are standards for some things despite the English / Metric systems. I have a Mini Mauser rifle, the barrel shank is metric, but, the scope mount holes are 6-48. An awful lot of Brownings are made in Japan, but the scope screws are still 6-48. Every camera I have, none of which are made in the USA, my spotting scopes also, the tripod sockets are all 1/4-20. Bottom line is, it's just a threaded hole, cutting tools are used worldwide, as are many standard hardware sizes. Link to comment Share on other sites More sharing options...
SinistralRifleman Posted August 3, 2016 Share Posted August 3, 2016 They are metric. m4-0.7 x 6mm is what our Aimpoint mounts for the 1301 COMP use. Link to comment Share on other sites More sharing options...
dogtired Posted August 3, 2016 Share Posted August 3, 2016 Interesting. I have that tap. I will run it in and see if it cuts anything. 6-48 threads without issue but I have not attached anything either. Link to comment Share on other sites More sharing options...
Paul49 Posted August 3, 2016 Share Posted August 3, 2016 (edited) Interesting. I have that tap. I will run it in and see if it cuts anything. 6-48 threads without issue but I have not attached anything either. Go gently with that tap since you are dealing with aluminum threads in an aluminum receiver. There are 2.54 centimeters per inch or 25.4 mm per inch. A thread pitch of 0.7 (distance peak to adjacent thread peak) is 25.4/0.7 or about 36 threads per inch. The holes are shallow, so there might not be enough depth for the thread count to be as relevant as a deeper or longer threaded hole. This would be especially true if the OD of the 6-48 is slightly undersized or less snug that the specified screw. The aluminum threads are thin and potentially forgiving, but also may be easily mis-threaded or stripped. I emailed Beretta Customer Service yesterday and await their reply. Edited August 3, 2016 by Paul49 Link to comment Share on other sites More sharing options...
dogtired Posted August 4, 2016 Share Posted August 4, 2016 I remembered I had a M4 screw left over from the project that required the tap. It does not fit the 1301 Comp, it may fit the tactical. The M4 screw did fit in the 8-40 thread. I still maintain 6-48 on my gun. Link to comment Share on other sites More sharing options...
Paul49 Posted August 4, 2016 Share Posted August 4, 2016 (edited) If the 6-48 fits, then it's likely either M3 or M3.5 with a thread pitch close to 48 per inch. Hopefully Beretta will get back to me soon. Here is a metric to English conversion reference for fasteners: http://elginfasteners.com/resources/metric-bolt-conversion-metric-to-standard-bolt-conversion/ Edited August 4, 2016 by Paul49 Link to comment Share on other sites More sharing options...
Craig N Posted August 7, 2016 Share Posted August 7, 2016 Hmm...Beretta......Italian........Metric threading. Just some random thoughts. Yes! It takes a 6mm hex wrench to adjust the seating depth of the sling swivel cup in the stock. When you're looking for that information it's the best hid thing on the interwebz. Link to comment Share on other sites More sharing options...
trgt Posted August 7, 2016 Share Posted August 7, 2016 This is probably the part?... no size listed though ... http://www.brownells.com/rifle-parts/forend-amp-handguard-parts/handguard-amp-rail-hardware/handguard-screws/sight-rail-screw-1301-prod87051.aspx Link to comment Share on other sites More sharing options...
dogtired Posted August 8, 2016 Share Posted August 8, 2016 Damn, $40 for the screws? Link to comment Share on other sites More sharing options...
dmshozer1 Posted August 8, 2016 Author Share Posted August 8, 2016 This is probably the part?... no size listed though ... http://www.brownells.com/rifle-parts/forend-amp-handguard-parts/handguard-amp-rail-hardware/handguard-screws/sight-rail-screw-1301-prod87051.aspx Thanks for the information. For the moment I have two mystery screws in a Ruger pistol rail holding the Fastfire to the receiver. Working so far but if I keep it on I will get the proper screws. So far I like it. Man does it group slugs at 75 yds. 4" most of the time with B&P's. Not sure yet If I like it on static targets. Seems slower. Nice thing is if it fails I just go to the front sight. Link to comment Share on other sites More sharing options...
BoyGlock Posted August 13, 2016 Share Posted August 13, 2016 I gaged the threads on the screws that came with the Beretta rail mount. Its m4x0.7. Link to comment Share on other sites More sharing options...
dogtired Posted August 17, 2016 Share Posted August 17, 2016 They must tap them in different sizes as mine is not m4x0.7. Link to comment Share on other sites More sharing options...
Paul49 Posted August 18, 2016 Share Posted August 18, 2016 Emailed Beretta about this, but got no answer. Called customer service today and was told M4-7.5, presumably meant m4-0.75, although that was not a size in the conversion table I found via Google. He also said the 1301 Comp and Tactical were the same..... Link to comment Share on other sites More sharing options...
BoyGlock Posted August 18, 2016 Share Posted August 18, 2016 7 hours ago, Paul49 said: Emailed Beretta about this, but got no answer. Called customer service today and was told M4-7.5, presumably meant m4-0.75, although that was not a size in the conversion table I found via Google. He also said the 1301 Comp and Tactical were the same..... interesting. I gaged my screws for .75, doesnt match. .70 does to a tee. Link to comment Share on other sites More sharing options...
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