What's the difference between buying a gun online that you can't dry fire and buying a gun with a trigger lock on it that you can't dry fire?
I was taught to shoot matches and reload while building a match 1911 from Norinco donor with Wilson Combat components from a seasoned bullseye match shooter doing all the fitting including a 2.5 lb trigger job.
I learned accuracy of pistol to produce tight groups on target primarily comes from muzzle not moving much when bullet exits the barrel. What I learned from that trigger job is firing pin/striker release is not an "instantaneous" event rather a sequence of events that require increasing amount of force to undo several intentional safeguards and mechanical action of metal-to-metal contact surfaces overcoming friction/tension applied by springs and leverage; and muzzle is moving the whole time from shooter induced input on trigger/grip and what's going on inside the pistol as stated by Jerry Miculek and Brian Zins -
https://www.thehighroad.org/index.php?threads/trigger-control.834737/page-2#post-11245640
When I did Burwell site posted trigger job on my M&P40/45 from gritty 9-10 lbs down to smooth 4.5 lbs, certain engagement surfaces HAD to be "reshaped" from round circle to a smooth incline and metal-to-metal surfaces polished so the sequence of undoing intentional safeguards and metal-to-metal surface friction decreased -
http://www.burwellguns.com/M&Ptriggerjob1.htm
And why do we do trigger jobs or replace triggers? Because even after break-in of trigger parts, front sight/muzzle still moves when firing pin/striker is released when dry fired.
What most people do not realize is that there is "natural point of aim" that is produced by pistol properly gripped in hand(s) when
proper trigger control is exercised and this "natural point of aim" can be repeated even with eyes closed to produce fast point shooting tight groups with accurate enough ammunition (See my signature line on "Holes on target speak volumes") as demonstrated by these videos -
https://www.thehighroad.org/index.p...hose-with-vision-issues.891558/#post-11996959
So when buying a pistol, starting out with a pistol that doesn't move the front sight/muzzle (Or that moves minimally) when dry fired will help produce greater accuracy after trigger/gun parts break-in. You can't do this buying guns online or not being able to dry fire. When I bought my last Glock 23, I went through several Glock 23s while dry firing. When the range/gun store employee asked what I was looking at, I told him modular assembly of parts did not always produce optimal trigger parts mating and showed him how the front sight jerked/moved when the striker was released and the one I decided to buy did not (When he dry fired comparing the two pistols, he was surprised). Yes, trigger surfaces will smooth out during break-in, but starting out with pistol that doesn't move the front sight/muzzle (Or move minimally as possible) likely will result in more accurate pistol.
During my 10,000+ round "real world" 22LR comparison testing using brand new 10/22 and T/CR22 where every 5/10 shot groups were captured, factory 10/22 trigger pull went from gritty 7.5 lbs to cleaner/smoother 4.7-4.8 lbs after 3000 rounds and then down to 4.5 lbs after 3500 rounds, it still added significant input to trigger after "real world" break-in resulting in left/right POI deviation (BTW, T/CR22 factory trigger went from 6 lbs down to 4.5 lbs). So triggers were updated with Volquartsen Target Hammer kits which reduced 10/22 trigger pull down to 2.25 lbs (2.75 lbs after initial installation) and 2 lbs for T/CR22 to minimize shooter induced flyers (Until I needed to replace/rework bolt to pin firing pin and square/headspace bolt face to reduce flyers further). On my last range trip, after 3000 rounds 10/22 Volquartsen trigger was just over 2 lbs and after 1500 rounds, T/CR22 trigger was just under 2 lbs -
https://www.thehighroad.org/index.p...nition-comparison.908102/page-2#post-12812234
So for me, being able to dry fire is pretty important.