Image source: Getty Images See all posts by Kirsteen Mackay Kirsteen owns shares of BP. The Motley Fool UK owns shares of and has recommended Tesla. The Motley Fool UK has recommended Frontier Developments. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors. Why another stock market crash may be a once-in-a-lifetime chance to buy bargain shares Our 6 ‘Best Buys Now’ Shares Kirsteen Mackay | Monday, 21st December, 2020 For regular Motley Fool share tips and help with choosing the best UK shares to buy now and during a stock market crash, sign up to the Motley Fool today. Enter Your Email Address Adventurous investors like you won’t want to miss out on what could be a truly astonishing opportunity…You see, over the past three years, this AIM-listed company has been quietly powering ahead… rewarding its shareholders with generous share price growth thanks to a carefully orchestrated ‘buy and build’ strategy.And with a first-class management team at the helm, a proven, well-executed business model, plus market-leading positions in high-margin, niche products… our analysts believe there’s still plenty more potential growth in the pipeline.Here’s your chance to discover exactly what has got our Motley Fool UK investment team all hot-under-the-collar about this tiny £350+ million enterprise… inside a specially prepared free investment report.But here’s the really exciting part… right now, we believe many UK investors have quite simply never heard of this company before! Click here to claim your copy of this special investment report — and we’ll tell you the name of this Top Small-Cap Stock… free of charge! The high-calibre small-cap stock flying under the City’s radar Since the March stock market crash, investors globally have been wondering if another stock market crash is imminent. So far, we’ve avoided it, and some stocks have enjoyed an incredible rally, particularly last month. But despite November’s excitement at the prospect of a vaccine rollout, the end of the year is looking less and less promising. So, does this present an opportunity to buy bargain shares? I think it does.FTSE 100 fallingIt seems a mutated version of the virus is rapidly spreading across the UK. So Boris Johnson and his government have responded with an emergency Tier 4 lockdown in some areas. Unsurprisingly, the FTSE 100 is falling. It appears the only reason the index has not fallen further is that the pound is also being hammered as Brexit continues to drag on and on and on. Many of the companies present in the FTSE 100 have an international presence with earnings reported in dollars. This means they benefit from a weak pound.5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…Nevertheless, among the battered remnants of a stock market crash, some shining gems can be found. These are the FTSE 100 and FTSE 250 companies that have the means to survive and emerge resplendent from the wreckage of market crash doom.Bargain sharesFor retail investors like me, it provides an opportunity to buy bargain shares. In a bull market, favourite companies get so much recognition, they often become overvalued. This has been illustrated by Tesla’s recent run of good fortune. It’s also been apparent in some UK stocks, such as Games Workshop and Frontier Developments. I’d like to own shares in either of these companies far into the future, but I’m put off by their high price-to-earnings ratios. A market crash provides an opportunity for savvy investors to buy good quality companies at knock-down prices.The risk of declining share prices is something all investors face, but it’s easy to overlook this during a bull market. As such, a market crash is a panic-inducing moment for even the most experienced investor. But keeping a level head can create a once-in-a-lifetime chance to buy bargain shares.Suppressed share prices in the FTSE 100In the FTSE 100 this morning, International Consolidated Airlines Group (IAG) has fallen nearly 10%, Rolls-Royce is not much better crashing over 8% and BP is down nearly 5%. The price of oil is slipping because many countries have banned air travel to the UK as they try to prevent the mutated virus from spreading too rapidly.I think a market crash could provide a bargain hunting opportunity of a lifetime. Not just for high-value stocks at knock-down prices. But also for the suppressed stocks like BP and Rolls-Royce that have a competitive advantage in their sectors. I think these former FTSE stars have a chance at sustained recovery over the long term.A market crash is never a pleasant event to witness, but with cash at the ready, it can be a great chance to build a stronger portfolio on the path to financial freedom. Simply click below to discover how you can take advantage of this. I would like to receive emails from you about product information and offers from The Fool and its business partners. Each of these emails will provide a link to unsubscribe from future emails. More information about how The Fool collects, stores, and handles personal data is available in its Privacy Statement. Renowned stock-picker Mark Rogers and his analyst team at The Motley Fool UK have named 6 shares that they believe UK investors should consider buying NOW.So if you’re looking for more stock ideas to try and best position your portfolio today, then it might be a good day for you. Because we’re offering a full 33% off your first year of membership to our flagship share-tipping service, backed by our ‘no quibbles’ 30-day subscription fee refund guarantee.